def findPotentialPassingTones(show=True):
g = corpus.parse("gloria")
gcn = g.parts["cantus"].measures(1, 126).flat.notesAndRests
gcn[0].lyric = ""
gcn[-1].lyric = ""
for i in range(1, len(gcn) - 1):
prev = gcn[i - 1]
cur = gcn[i]
next = gcn[i + 1] # @ReservedAssignment
cur.lyric = ""
if "Rest" in prev.classes or "Rest" in cur.classes or "Rest" in next.classes:
continue
int1 = interval.notesToInterval(prev, cur)
if int1.isStep is False:
continue
int2 = interval.notesToInterval(cur, next)
if int2.isStep is False:
continue
cma = cur.beatStrength
if cma < 1 and cma <= prev.beatStrength and cma <= next.beatStrength:
if int1.direction == int2.direction:
cur.lyric = "pt" # neighbor tone
else:
cur.lyric = "nt" # passing tone
if show:
g.parts["cantus"].show()
def capuaRuleOne(srcStream):
'''
Applies Nicolaus de Capua's first rule to the given srcStream, i.e. if a line descends
a major second then ascends back to the original note, the major second is
made into a minor second. Also copies the relevant accidentals into
`Note.editorial.misc["saved-accidental"]` and changes `Note.editorial.color`
for rule 1 (blue green blue).
The relevant Rule number is also stored in `Note.editorial.misc['capua_rule_number']` which
can be got out by OR-ing this.
Returns the number of notes that were changed (not counting notes whose colors were changed).
'''
numChanged = 0
ssn = srcStream.flat.notesAndRests
for i in range(0, len(ssn) - 2):
n1 = ssn[i]
n2 = ssn[i + 1]
n3 = ssn[i + 2]
if (n1.isRest or n2.isRest or n3.isRest):
continue
i1 = interval.notesToInterval(n1, n2)
i2 = interval.notesToInterval(n2, n3)
if (n1.pitch.accidental is not None
or n3.pitch.accidental is not None):
continue
### never seems to improve things...
if n2.step == "A" or n2.step == "D":
continue
## e.g. G, F, G => G, F#, G
if i1.directedName == "M-2" and \
i2.directedName == "M2":
numChanged += 1
if ("capua" in n2.editorial.misc):
n2.editorial.misc['capua_rule_number'] += RULE_ONE
else:
n2.editorial.misc['capua_rule_number'] = RULE_ONE
if (n2.pitch.accidental is not None
and n2.pitch.accidental.name == "flat"):
n2.editorial.misc["saved-accidental"] = n2.pitch.accidental
n2.pitch.accidental = None
n2.editorial.ficta = pitch.Accidental("natural")
n2.editorial.misc["capua-ficta"] = pitch.Accidental("natural")
n1.editorial.color = "blue"
n2.editorial.color = "forestGreen"
n3.editorial.color = "blue"
else:
n2.editorial.ficta = pitch.Accidental("sharp")
n2.editorial.misc["capua-ficta"] = pitch.Accidental("sharp")
n1.editorial.color = "blue"
n2.editorial.color = "ForestGreen"
n3.editorial.color = "blue"
return numChanged
def capuaRuleFourB(srcStream):
'''
See capuaRuleOne for precise instructions.
Applies more probable interpretation of Capua's fourth rule to the given
srcStream, i.e. if a descending minor third is followed by a descending major
second, the intervals will be changed to a major third followed by a minor
second. Also copies any relevant accidental to note.editorial.misc under
"saved-accidental" and changes note.editorial.color for rule 4 (orange
green orange).
returns the number of times a note was changed.
'''
numChanged = 0
ssn = srcStream.flat.notesAndRests
for i in range(0, len(ssn) - 2):
n1 = ssn[i]
n2 = ssn[i + 1]
n3 = ssn[i + 2]
if n1.isRest or \
n2.isRest or \
n3.isRest:
continue
i1 = interval.notesToInterval(n1, n2)
i2 = interval.notesToInterval(n2, n3)
if n1.accidental is not None or \
n3.accidental is not None:
continue
### never seems to improve things...
if n2.step == "A" or n2.step == "D":
continue
# e.g., D F G => D F# G or G Bb C => G B C
if i1.directedName == "m3" and \
i2.directedName == "M2":
numChanged += 1
if ("capua" in n2.editorial.misc):
n2.editorial.misc['capua_rule_number'] += RULE_FOUR_B
else:
n2.editorial.misc['capua_rule_number'] = RULE_FOUR_B
if (n2.accidental is not None and n2.accidental.name == "flat"):
n2.editorial.misc["saved-accidental"] = n2.accidental
n2.accidental = None
n2.editorial.ficta = pitch.Accidental("natural")
n2.editorial.misc["capua-ficta"] = pitch.Accidental("natural")
n1.editorial.color = "orange"
n2.editorial.color = "green"
n3.editorial.color = "orange"
else:
n2.editorial.ficta = pitch.Accidental("sharp")
n2.editorial.misc["capua-ficta"] = pitch.Accidental("sharp")
n1.editorial.color = "orange"
n2.editorial.color = "green"
n3.editorial.color = "orange"
return numChanged
def capuaRuleTwo(srcStream):
"""
See capuaRuleOne for precise instructions.
Applies Capua's second rule to the given srcStream, i.e. if four notes are
ascending with the pattern M2 m2 M2, the intervals shall be made M2 M2 m2.
Also changes note.editorial.color for rule 2 (purple purple green purple).
returns the number of times any note was changed
"""
numChanged = 0
ssn = srcStream.flat.notesAndRests
for i in range(0, len(ssn) - 3):
n1 = ssn[i]
n2 = ssn[i + 1]
n3 = ssn[i + 2]
n4 = ssn[i + 3]
if n1.isRest or n2.isRest or n3.isRest or n4.isRest:
continue
i1 = interval.notesToInterval(n1, n2)
i2 = interval.notesToInterval(n2, n3)
i3 = interval.notesToInterval(n3, n4)
if n1.accidental is not None or n2.accidental is not None or n4.accidental is not None:
continue
### never seems to improve things...
if n3.step == "A" or n3.step == "D":
continue
# e.g., D E F G => D E F# G
# or F A Bb C => F A B C
if i1.directedName == "M2" and i2.directedName == "m2" and i3.directedName == "M2":
numChanged += 1
if "capua" in n3.editorial.misc:
n3.editorial.misc["capua_rule_number"] += RULE_TWO
else:
n3.editorial.misc["capua_rule_number"] = RULE_TWO
if n3.accidental is not None and n3.accidental.name == "flat":
n3.editorial.misc["saved-accidental"] = n3.accidental
n3.accidental = None
n3.editorial.ficta = pitch.Accidental("natural")
n3.editorial.misc["capua-ficta"] = pitch.Accidental("natural")
n1.editorial.color = "purple"
n2.editorial.color = "purple"
n3.editorial.color = "ForestGreen"
n4.editorial.color = "purple"
else:
n3.editorial.ficta = pitch.Accidental("sharp")
n3.editorial.misc["capua-ficta"] = pitch.Accidental("sharp")
n1.editorial.color = "purple"
n2.editorial.color = "purple"
n3.editorial.color = "ForestGreen"
n4.editorial.color = "purple"
return numChanged
def capuaRuleFourB(srcStream):
'''
See capuaRuleOne for precise instructions.
Applies more probable interpretation of Capua's fourth rule to the given
srcStream, i.e. if a descending minor third is followed by a descending major
second, the intervals will be changed to a major third followed by a minor
second. Also copies any relevant accidental to note.editorial.misc under
"saved-accidental" and changes note.editorial.color for rule 4 (orange
green orange).
returns the number of times a note was changed.
'''
numChanged = 0
ssn = srcStream.flat.notesAndRests
for i in range(0, len(ssn)-2):
n1 = ssn[i]
n2 = ssn[i+1]
n3 = ssn[i+2]
if n1.isRest or \
n2.isRest or \
n3.isRest:
continue
i1 = interval.notesToInterval(n1,n2)
i2 = interval.notesToInterval(n2,n3)
if n1.pitch.accidental is not None or \
n3.pitch.accidental is not None:
continue
### never seems to improve things...
if n2.step == "A" or n2.step == "D":
continue
# e.g., D F G => D F# G or G Bb C => G B C
if i1.directedName == "m3" and \
i2.directedName == "M2":
numChanged += 1
if ("capua" in n2.editorial.misc):
n2.editorial.misc['capua_rule_number'] += RULE_FOUR_B
else:
n2.editorial.misc['capua_rule_number'] = RULE_FOUR_B
if (n2.pitch.accidental is not None and n2.pitch.accidental.name == "flat"):
n2.editorial.misc["saved-accidental"] = n2.pitch.accidental
n2.pitch.accidental = None
n2.editorial.ficta = pitch.Accidental("natural")
n2.editorial.misc["capua-ficta"] = pitch.Accidental("natural")
n1.editorial.color = "orange"
n2.editorial.color = "green"
n3.editorial.color = "orange"
else:
n2.editorial.ficta = pitch.Accidental("sharp")
n2.editorial.misc["capua-ficta"] = pitch.Accidental("sharp")
n1.editorial.color = "orange"
n2.editorial.color = "green"
n3.editorial.color = "orange"
return numChanged
def findPotentialPassingTones(show=True):
g = corpus.parse('gloria')
gcn = g.parts['cantus'].measures(1, 126).flat.notesAndRests
gcn[0].lyric = ""
gcn[-1].lyric = ""
for i in range(1, len(gcn) - 1):
prev = gcn[i - 1]
cur = gcn[i]
nextN = gcn[i + 1]
cur.lyric = ""
if ("Rest" in prev.classes or "Rest" in cur.classes
or "Rest" in nextN.classes):
continue
int1 = interval.notesToInterval(prev, cur)
if int1.isStep is False:
continue
int2 = interval.notesToInterval(cur, nextN)
if int2.isStep is False:
continue
cma = cur.beatStrength
if (cma < 1 and cma <= prev.beatStrength
and cma <= nextN.beatStrength):
if int1.direction == int2.direction:
cur.lyric = 'pt' # neighbor tone
else:
cur.lyric = 'nt' # passing tone
if show:
g.parts['cantus'].show()
def capuaRuleOne(srcStream):
'''
Applies Nicolaus de Capua's first rule to the given srcStream, i.e. if a line descends
a major second then ascends back to the original note, the major second is
made into a minor second. Also copies the relevant accidentals into
`Note.editorial.misc["saved-accidental"]` and changes `Note.style.color`
for rule 1 (blue green blue).
The relevant Rule number is also stored in `Note.editorial.misc['capua_rule_number']` which
can be got out by OR-ing this.
Returns the number of notes that were changed (not counting notes whose colors were changed).
'''
numChanged = 0
ssn = srcStream.flat.notesAndRests
for i in range(len(ssn) - 2):
n1 = ssn[i]
n2 = ssn[i + 1]
n3 = ssn[i + 2]
if (n1.isRest or n2.isRest or n3.isRest):
continue
i1 = interval.notesToInterval(n1, n2)
i2 = interval.notesToInterval(n2, n3)
if (n1.pitch.accidental is not None
or n3.pitch.accidental is not None):
continue
### never seems to improve things...
if n2.step == "A" or n2.step == "D":
continue
## e.g. G, F, G => G, F#, G
if (i1.directedName == "M-2"
and i2.directedName == "M2"):
numChanged += 1
if ("capua" in n2.editorial.misc):
n2.editorial.misc['capua_rule_number'] += RULE_ONE
else:
n2.editorial.misc['capua_rule_number'] = RULE_ONE
if (n2.pitch.accidental is not None and n2.pitch.accidental.name == "flat"):
n2.editorial.misc["saved-accidental"] = n2.pitch.accidental
n2.pitch.accidental = None
n2.editorial.ficta = pitch.Accidental("natural")
n2.editorial.misc["capua-ficta"] = pitch.Accidental("natural")
n1.style.color = "blue"
n2.style.color = "forestGreen"
n3.style.color = "blue"
else:
n2.editorial.ficta = pitch.Accidental("sharp")
n2.editorial.misc["capua-ficta"] = pitch.Accidental("sharp")
n1.style.color = "blue"
n2.style.color = "ForestGreen"
n3.style.color = "blue"
return numChanged
def isParallelUnison(self, note11, note12, note21, note22):
'''Given four notes, assuming the first pair sounds at the same time and
the second pair sounds at the same time, returns True if the two
harmonic intervals are P8 and False otherwise.'''
interval1 = interval.notesToInterval(note11, note21)
interval2 = interval.notesToInterval(note12, note22)
if interval1.name == interval2.name == "P1": return True
else: return False
def capuaRuleOne(srcStream):
'''
Applies Nicolaus de Capua's first rule to the given srcStream, i.e. if a line descends
a major second then ascends back to the original note, the major second is
made into a minor second. Also copies the relevant accidentals into
`Note.editorial.savedAccidental` and changes `Note.style.color`
for rule 1 (blue green blue).
The relevant Rule number is also stored in `Note.editorial.capuaRuleNumber']` which
can be got out by OR-ing this.
Returns the number of notes that were changed (not counting notes whose colors were changed).
'''
numChanged = 0
ssn = srcStream.flat.notesAndRests
for i in range(len(ssn) - 2):
n1 = ssn[i]
n2 = ssn[i + 1]
n3 = ssn[i + 2]
if n1.isRest or n2.isRest or n3.isRest:
continue
i1 = interval.notesToInterval(n1, n2)
i2 = interval.notesToInterval(n2, n3)
if (n1.pitch.accidental is not None
or n3.pitch.accidental is not None):
continue
# never seems to improve things...
if n2.step == 'A' or n2.step == 'D':
continue
# e.g. G, F, G => G, F#, G
if (i1.directedName == 'M-2' and i2.directedName == 'M2'):
numChanged += 1
if 'capuaRuleNumber' in n2.editorial:
n2.editorial.capuaRuleNumber += RULE_ONE
else:
n2.editorial.capuaRuleNumber = RULE_ONE
if n2.pitch.accidental is not None and n2.pitch.accidental.name == 'flat':
n2.editorial.savedAccidental = n2.pitch.accidental
n2.pitch.accidental = None
n2.editorial.ficta = pitch.Accidental('natural')
n2.editorial.capuaFicta = pitch.Accidental('natural')
n1.style.color = 'blue'
n2.style.color = 'forestGreen'
n3.style.color = 'blue'
else:
n2.editorial.ficta = pitch.Accidental('sharp')
n2.editorial.capuaFicta = pitch.Accidental('sharp')
n1.style.color = 'blue'
n2.style.color = 'ForestGreen'
n3.style.color = 'blue'
return numChanged
def capuaRuleFourB(srcStream):
'''
See capuaRuleOne for precise instructions.
Applies more probable interpretation of Capua's fourth rule to the given
srcStream, i.e. if a descending minor third is followed by a descending major
second, the intervals will be changed to a major third followed by a minor
second. Also copies any relevant accidental to note.editorial.savedAccidental
and changes note.style.color for rule 4 (orange
green orange).
returns the number of times a note was changed.
'''
numChanged = 0
ssn = srcStream.flat.notesAndRests
for i in range(len(ssn) - 2):
n1 = ssn[i]
n2 = ssn[i + 1]
n3 = ssn[i + 2]
if n1.isRest or n2.isRest or n3.isRest:
continue
i1 = interval.notesToInterval(n1, n2)
i2 = interval.notesToInterval(n2, n3)
if (n1.pitch.accidental is not None
or n3.pitch.accidental is not None):
continue
# never seems to improve things...
if n2.step == 'A' or n2.step == 'D':
continue
# e.g., D F G => D F# G or G Bb C => G B C
if i1.directedName == 'm3' and i2.directedName == 'M2':
numChanged += 1
if 'capuaRuleNumber' in n2.editorial:
n2.editorial.capuaRuleNumber += RULE_FOUR_B
else:
n2.editorial.capuaRuleNumber = RULE_FOUR_B
if n2.pitch.accidental is not None and n2.pitch.accidental.name == 'flat':
n2.editorial.savedAccidental = n2.pitch.accidental
n2.pitch.accidental = None
n2.editorial.ficta = pitch.Accidental('natural')
n2.editorial.capuaFicta = pitch.Accidental('natural')
n1.style.color = 'orange'
n2.style.color = 'green'
n3.style.color = 'orange'
else:
n2.editorial.ficta = pitch.Accidental('sharp')
n2.editorial.capuaFicta = pitch.Accidental('sharp')
n1.style.color = 'orange'
n2.style.color = 'green'
n3.style.color = 'orange'
return numChanged
def capuaRuleOne(srcStream):
'''Applies Nicolaus de Capua's first rule to the given srcStream, i.e. if a line descends
a major second then ascends back to the original note, the major second is
made into a minor second. Also copies the relevant accidentals into
note.editorial.misc under "saved-accidental" and changes note.editorial.color
for rule 1 (blue green blue).
Returns the number of changes.
'''
numChanged = 0
ssn = srcStream.notes
for i in range(0, len(ssn)-2):
n1 = ssn[i]
n2 = ssn[i+1]
n3 = ssn[i+2]
if n1.isRest or \
n2.isRest or \
n3.isRest:
continue
i1 = notesToInterval(n1,n2)
i2 = notesToInterval(n2,n3)
if n1.accidental is not None or \
n3.accidental is not None:
continue
### never seems to improve things...
if n2.step == "A" or n2.step == "D":
continue
## e.g. G, F, G => G, F#, G
if i1.directedName == "M-2" and \
i2.directedName == "M2":
numChanged += 1
if ("capua" in n2.editorial.misc):
n2.editorial.misc['capua_rule_number'] += RULE_ONE
else:
n2.editorial.misc['capua_rule_number'] = RULE_ONE
if (n2.accidental is not None and n2.accidental.name == "flat"):
n2.editorial.misc["saved-accidental"] = n2.accidental
n2.accidental = None
n2.editorial.ficta = Accidental("natural")
n2.editorial.misc["capua-ficta"] = Accidental("natural")
n1.editorial.color = "blue"
n2.editorial.color = "forestGreen"
n3.editorial.color = "blue"
else:
n2.editorial.ficta = Accidental("sharp")
n2.editorial.misc["capua-ficta"] = Accidental("sharp")
n1.editorial.color = "blue"
n2.editorial.color = "ForestGreen"
n3.editorial.color = "blue"
return numChanged
def capuaRuleFourA(srcStream):
'''
See capuaRuleOne for precise instructions.
Applies one interpretation of Capua's fourth rule to the given srcStream,
i.e. if a descending minor third is followed by a descending major second,
the intervals will be changed to a major third followed by a minor second.
Also changes note.editorial.color for rule 4 (orange green orange).
returns the number of notes that were changed
This rule is a less likely interpretation of the ambiguous rule 4, thus
applyCapuaToStream uses capuaRuleFourB instead.
'''
numChanged = 0
ssn = srcStream.flat.notesAndRests
for i in range(0, len(ssn) - 2):
n1 = ssn[i]
n2 = ssn[i + 1]
n3 = ssn[i + 2]
if n1.isRest or \
n2.isRest or \
n3.isRest:
continue
i1 = interval.notesToInterval(n1, n2)
i2 = interval.notesToInterval(n2, n3)
if n1.accidental is not None or \
n2.accidental is not None or \
n3.accidental is not None:
continue
### never seems to improve things...
if n2.step == "A" or n2.step == "D":
continue
# e.g., D B A => D Bb A
if i1.directedName == "m-3" and \
i2.directedName == "M-2":
numChanged += 1
if ("capua" in n2.editorial.misc):
n2.editorial.misc['capua_rule_number'] += RULE_FOUR_A
else:
n2.editorial.misc['capua_rule_number'] = RULE_FOUR_A
n2.editorial.ficta = pitch.Accidental("flat")
n2.editorial.misc["capua-ficta"] = pitch.Accidental("flat")
n1.editorial.color = "orange"
n2.editorial.color = "ForestGreen"
n3.editorial.color = "orange"
return numChanged
def capuaRuleFourA(srcStream):
'''
See capuaRuleOne for precise instructions.
Applies one interpretation of Capua's fourth rule to the given srcStream,
i.e. if a descending minor third is followed by a descending major second,
the intervals will be changed to a major third followed by a minor second.
Also changes note.editorial.color for rule 4 (orange green orange).
returns the number of notes that were changed
This rule is a less likely interpretation of the ambiguous rule 4, thus
applyCapuaToStream uses capuaRuleFourB instead.
'''
numChanged = 0
ssn = srcStream.flat.notesAndRests
for i in range(0, len(ssn)-2):
n1 = ssn[i]
n2 = ssn[i+1]
n3 = ssn[i+2]
if n1.isRest or \
n2.isRest or \
n3.isRest:
continue
i1 = interval.notesToInterval(n1,n2)
i2 = interval.notesToInterval(n2,n3)
if n1.pitch.accidental is not None or \
n2.pitch.accidental is not None or \
n3.pitch.accidental is not None:
continue
### never seems to improve things...
if n2.step == "A" or n2.step == "D":
continue
# e.g., D B A => D Bb A
if i1.directedName == "m-3" and \
i2.directedName == "M-2":
numChanged += 1
if ("capua" in n2.editorial.misc):
n2.editorial.misc['capua_rule_number'] += RULE_FOUR_A
else:
n2.editorial.misc['capua_rule_number'] = RULE_FOUR_A
n2.editorial.ficta = pitch.Accidental("flat")
n2.editorial.misc["capua-ficta"] = pitch.Accidental("flat")
n1.editorial.color = "orange"
n2.editorial.color = "ForestGreen"
n3.editorial.color = "orange"
return numChanged
def capuaRuleThree(srcStream):
'''
See capuaRuleOne for precise instructions.
Applies Capua's third rule to the given srcStream, i.e. if there is a
descending major third followed by an ascending major second, the second
note will be made a half-step higher so that there is a descending minor
third followed by an ascending minor second. Also changes
note.editorial.color for rule 3 (pink green pink).
returns the number of times a note was changed
'''
numChanged = 0
ssn = srcStream.flat.notesAndRests
for i in range(0, len(ssn) - 2):
n1 = ssn[i]
n2 = ssn[i + 1]
n3 = ssn[i + 2]
if n1.isRest or \
n2.isRest or \
n3.isRest:
continue
i1 = interval.notesToInterval(n1, n2)
i2 = interval.notesToInterval(n2, n3)
if n1.accidental is not None or \
n2.accidental is not None or \
n3.accidental is not None:
continue
### never seems to improve things...
if n2.step == "A" or n2.step == "D":
continue
# e.g., E C D => E C# D
if i1.directedName == "M-3" and \
i2.directedName == "M2":
numChanged += 1
if ("capua" in n2.editorial.misc):
n2.editorial.misc['capua_rule_number'] += RULE_THREE
else:
n2.editorial.misc['capua_rule_number'] = RULE_THREE
n2.editorial.ficta = pitch.Accidental("sharp")
n2.editorial.misc["capua-ficta"] = pitch.Accidental("sharp")
n1.editorial.color = "DeepPink"
n2.editorial.color = "ForestGreen"
n3.editorial.color = "DeepPink"
return numChanged
def capuaRuleThree(srcStream):
'''
See capuaRuleOne for precise instructions.
Applies Capua's third rule to the given srcStream, i.e. if there is a
descending major third followed by an ascending major second, the second
note will be made a half-step higher so that there is a descending minor
third followed by an ascending minor second. Also changes
note.editorial.color for rule 3 (pink green pink).
returns the number of times a note was changed
'''
numChanged = 0
ssn = srcStream.flat.notesAndRests
for i in range(0, len(ssn)-2):
n1 = ssn[i]
n2 = ssn[i+1]
n3 = ssn[i+2]
if n1.isRest or \
n2.isRest or \
n3.isRest:
continue
i1 = interval.notesToInterval(n1,n2)
i2 = interval.notesToInterval(n2,n3)
if n1.pitch.accidental is not None or \
n2.pitch.accidental is not None or \
n3.pitch.accidental is not None:
continue
### never seems to improve things...
if n2.step == "A" or n2.step == "D":
continue
# e.g., E C D => E C# D
if i1.directedName == "M-3" and \
i2.directedName == "M2":
numChanged += 1
if ("capua" in n2.editorial.misc):
n2.editorial.misc['capua_rule_number'] += RULE_THREE
else:
n2.editorial.misc['capua_rule_number'] = RULE_THREE
n2.editorial.ficta = pitch.Accidental("sharp")
n2.editorial.misc["capua-ficta"] = pitch.Accidental("sharp")
n1.editorial.color = "DeepPink"
n2.editorial.color = "ForestGreen"
n3.editorial.color = "DeepPink"
return numChanged
def capuaRuleFourA(srcStream):
'''
See capuaRuleOne for precise instructions.
Applies one interpretation of Capua's fourth rule to the given srcStream,
i.e. if a descending minor third is followed by a descending major second,
the intervals will be changed to a major third followed by a minor second.
Also changes note.style.color for rule 4 (orange green orange).
returns the number of notes that were changed
This rule is a less likely interpretation of the ambiguous rule 4, thus
applyCapuaToStream uses capuaRuleFourB instead.
'''
numChanged = 0
ssn = srcStream.flat.notesAndRests
for i in range(len(ssn) - 2):
n1 = ssn[i]
n2 = ssn[i + 1]
n3 = ssn[i + 2]
if n1.isRest or n2.isRest or n3.isRest:
continue
i1 = interval.notesToInterval(n1, n2)
i2 = interval.notesToInterval(n2, n3)
if (n1.pitch.accidental is not None or n2.pitch.accidental is not None
or n3.pitch.accidental is not None):
continue
# never seems to improve things...
if n2.step == 'A' or n2.step == 'D':
continue
# e.g., D B A => D Bb A
if i1.directedName == 'm-3' and i2.directedName == 'M-2':
numChanged += 1
if 'capuaRuleNumber' in n2.editorial:
n2.editorial.capuaRuleNumber += RULE_FOUR_A
else:
n2.editorial.capuaRuleNumber = RULE_FOUR_A
n2.editorial.ficta = pitch.Accidental('flat')
n2.editorial.capuaFicta = pitch.Accidental('flat')
n1.style.color = 'orange'
n2.style.color = 'ForestGreen'
n3.style.color = 'orange'
return numChanged
def capuaRuleThree(srcStream):
'''
See capuaRuleOne for precise instructions.
Applies Capua's third rule to the given srcStream, i.e. if there is a
descending major third followed by an ascending major second, the second
note will be made a half-step higher so that there is a descending minor
third followed by an ascending minor second. Also changes
note.style.color for rule 3 (pink green pink).
returns the number of times a note was changed
'''
numChanged = 0
ssn = srcStream.flat.notesAndRests
for i in range(len(ssn) - 2):
n1 = ssn[i]
n2 = ssn[i + 1]
n3 = ssn[i + 2]
if n1.isRest or n2.isRest or n3.isRest:
continue
i1 = interval.notesToInterval(n1, n2)
i2 = interval.notesToInterval(n2, n3)
if (n1.pitch.accidental is not None or n2.pitch.accidental is not None
or n3.pitch.accidental is not None):
continue
# never seems to improve things...
if n2.step == 'A' or n2.step == 'D':
continue
# e.g., E C D => E C# D
if (i1.directedName == 'M-3' and i2.directedName == 'M2'):
numChanged += 1
if 'capuaRuleNumber' in n2.editorial:
n2.editorial.capuaRuleNumber += RULE_THREE
else:
n2.editorial.capuaRuleNumber = RULE_THREE
n2.editorial.ficta = pitch.Accidental('sharp')
n2.editorial.capuaFicta = pitch.Accidental('sharp')
n1.style.color = 'DeepPink'
n2.style.color = 'ForestGreen'
n3.style.color = 'DeepPink'
return numChanged
def searchForIntervals(notesStr):
'''
notesStr is the same as above. Now however we check to see
if the generic intervals are the same, rather than the note names.
Useful if the clef is missing.
'''
notesArr = notesStr.split()
noteObjArr = []
for tN in notesArr:
tNObj = note.Note()
tNObj.name = tN[0]
tNObj.octave = int(tN[1])
noteObjArr.append(tNObj)
interObjArr = []
for i in range(len(noteObjArr) - 1):
int1 = interval.notesToInterval(noteObjArr[i], noteObjArr[i + 1])
interObjArr.append(int1)
#print interObjArr
searcher1 = IntervalSearcher(interObjArr)
ballataObj = cadencebook.BallataSheet()
streamOpus = stream.Opus()
for thisWork in ballataObj:
print(thisWork.title)
for thisCadence in thisWork.snippets:
if thisCadence is None:
continue
for i in range(len(thisCadence.parts)):
colorFound(searcher1, thisCadence, streamOpus, thisWork, i)
if any(streamOpus):
streamOpus.show('lily.png')
def getDominant(self):
interval1to5 = interval.notesToInterval(self.tonic, self.pitchFromScaleDegree(5))
if interval1to5.specificName != "Perfect":
print(interval1to5.diatonicType)
raise ScaleException("This scale has no Dominant (Locrian perhaps?)")
else:
return self.pitchFromScaleDegree(5)
def resolves(voice, resolve_interval):
"""Given a voice starting with the note that must resolve, checks whether it resolves according to the provided resolveInterval integer
>>> from music21 import note, stream
>>> voice = stream.Part()
>>> for current_note in map(note.Note, ['f4', 'e4', 'f4']):
... voice.append(current_note)
>>> resolves(voice, -2)
True
>>> resolves(voice, 2)
False
"""
if len(voice) < 2:
return True
first_note = voice[0]
for note in voice[1:]:
current_interval = interval.notesToInterval(first_note, note)
if current_interval.generic.directed == resolve_interval:
return True
# returns false if the resolve interval is wrong or there a chromatic step in the wrong direction
if current_interval.generic.directed != 1 or resolve_interval * current_interval.chromatic.directed < 0:
return
return True
def transposed_to(
self,
pitch: Pitch = Pitch()) -> Tuple['SpotifyChord', Optional[Interval]]:
if self.is_no_chord():
return self, None
tr_int = interval.notesToInterval(self.root, pitch)
return self.transposed_by(tr_int), tr_int
def searchForIntervals(notesStr):
'''
notesStr is the same as above. Now however we check to see
if the generic intervals are the same, rather than the note names.
Useful if the clef is missing.
'''
notesArr = notesStr.split()
noteObjArr = []
for tN in notesArr:
tNObj = note.Note()
tNObj.name = tN[0]
tNObj.octave = int(tN[1])
noteObjArr.append(tNObj)
interObjArr = []
for i in range(len(noteObjArr) - 1):
int1 = interval.notesToInterval(noteObjArr[i], noteObjArr[i + 1])
interObjArr.append(int1)
#print interObjArr
searcher1 = IntervalSearcher(interObjArr)
ballataObj = cadencebook.BallataSheet()
streamOpus = stream.Opus()
for thisWork in ballataObj:
print(thisWork.title)
for thisCadence in thisWork.snippets:
if thisCadence is None:
continue
for i in range(len(thisCadence.parts)):
colorFound(searcher1, thisCadence, streamOpus, thisWork, i)
if any(streamOpus):
streamOpus.show('lily.png')
def generateFirstSpecies(self, stream1, minorScale):
'''Given a stream (the cantus firmus) and the stream's key in the
form of a MinorScale object, generates a stream of first species
counterpoint that follows the rules of 21M.301.'''
# DOES NOT YET CHECK FOR TOO MANY THIRDS/SIXTHS IN A ROW,
# DOES NOT YET RAISE LEADING TONES, AND DOES NOT CHECK FOR NOODLING.
stream2 = Stream([])
firstNote = stream1.notes[0]
choices = [interval.transposeNote(firstNote, "P1"),\
interval.transposeNote(firstNote, "P5"),\
interval.transposeNote(firstNote, "P8")]
note1 = random.choice(choices)
note1.duration = firstNote.duration
stream2.append(note1)
afterLeap = False
for i in range(1, len(stream1.notes)):
prevFirmus = stream1.notes[i-1]
currFirmus = stream1.notes[i]
prevNote = stream2.notes[i-1]
choices = self.generateValidNotes(prevFirmus, currFirmus, prevNote, afterLeap, minorScale)
if len(choices) == 0:
raise ModalCounterpointException("Sorry, please try again")
newNote = random.choice(choices)
newNote.duration = currFirmus.duration
stream2.append(newNote)
int = interval.notesToInterval(prevNote, newNote)
if int.generic.undirected > 3: afterLeap = True
else: afterLeap = False
return stream2
def isHiddenFifth(self, note11, note12, note21, note22):
'''Given four notes, assuming the first pair sounds at the same time and
the second pair sounds at the same time, returns True if there is a
hidden fifth and false otherwise.'''
interval1 = interval.notesToInterval(note11, note21)
interval2 = interval.notesToInterval(note12, note22)
interval3 = interval.notesToInterval(note11, note12)
interval4 = interval.notesToInterval(note21, note22)
if interval3.direction > 0 and interval4.direction > 0:
if interval2.name == "P5" and not interval1.name == "P5": return True
else: return False
elif interval3.direction < 0 and interval4.direction < 0:
if interval2.name == "P5" and not interval1.name == "P5": return True
else: return False
elif interval3.direction == interval4.direction == 0: return False
return False
def generateTripletBlues(blRealization=None, numRepeats=5): # 12/8
'''
Turns whole notes in twelve bar blues bass line to triplet blues bass line. Takes
in numRepeats, which is the number of times to repeat the bass line. Also, takes in a
realization of :meth:`~music21.figuredBass.examples.twelveBarBlues`. If none is provided,
a default realization with :attr:`~music21.figuredBass.rules.Rules.forbidVoiceOverlap`
set to False and :attr:`~music21.figuredBass.rules.Rules.partMovementLimits` set to
[(1, 4), (2, 12), (3, 12)] is used.
>>> from music21.figuredBass import examples
>>> #_DOCS_SHOW examples.generateTripletBlues(numRepeats=1).show()
.. image:: images/figuredBass/fbExamples_tripletBlues.*
:width: 700
'''
from music21 import converter
from music21 import stream
from music21 import interval
from music21 import meter
if blRealization is None:
bluesLine = twelveBarBlues()
fbRules = rules.Rules()
fbRules.partMovementLimits = [(1, 4), (2, 12), (3, 12)]
fbRules.forbidVoiceOverlap = False
blRealization = bluesLine.realize(fbRules)
sampleScore = blRealization.generateRandomRealizations(numRepeats)
tripletBassLine = converter.parse(
"tinynotation: BB-4 BB-8 D4 D8 F4 F8 A-8 G8 F8", makeNotation=False)
newBassLine = stream.Part()
for n in sampleScore[1].notes:
i = interval.notesToInterval(tripletBassLine[0], n)
tp = tripletBassLine.transpose(i)
for lyr in n.lyrics:
tp.notes.first().addLyric(lyr.text)
for m in tp.notes:
newBassLine.append(m)
newTopLine = stream.Part()
for sampleChord in sampleScore[0].notes:
sampleChordCopy = copy.deepcopy(sampleChord)
sampleChordCopy.quarterLength = 6.0
newTopLine.append(sampleChordCopy)
newScore = stream.Score()
newScore.append(meter.TimeSignature("12/8")) # Time signature
newScore.append(sampleScore[1][1]) # Key signature
newScore.insert(0, newTopLine)
newScore.insert(0, newBassLine)
return newScore
def countMelodicIntervals(self, sStream, found=None, ignoreDirection=True,
ignoreUnison=True):
'''
Find all unique melodic intervals in this Stream.
If `found` is provided as a dictionary, this dictionary will be used to store Intervals, and counts of Intervals already found will be incremented.
'''
# note that Stream.findConsecutiveNotes() and Stream.melodicIntervals()
# offer similar approaches, but return Streams and manage offsets and durations, components not needed here
if found == None:
found = {}
# if this has parts, need to move through each at a time
if sStream.hasPartLikeStreams():
procList = [s for s in sStream.getElementsByClass('Stream')]
else: # assume a single list of notes
procList = [sStream]
for p in procList:
# get only Notes for now, skipping rests and chords
noteStream = p.stripTies(inPlace=False).getElementsByClass('Note')
#noteStream.show()
for i, n in enumerate(noteStream):
if i <= len(noteStream) - 2:
nNext = noteStream[i+1]
else:
nNext = None
if nNext is not None:
#environLocal.printDebug(['creating interval from notes:', n, nNext, i])
i = interval.notesToInterval(n, nNext)
if ignoreUnison: # will apply to enharmonic eq unisons
if i.chromatic.semitones == 0:
continue
if ignoreDirection:
if i.chromatic.semitones < 0:
i = i.reverse()
# must use directed name for cases where ignoreDirection
# is false
if i.directedName not in found.keys():
found[i.directedName] = [i, 1]
else:
found[i.directedName][1] += 1 # increment counter
# def compare(x, y):
# return abs(x.chromatic.semitones) - abs(y.chromatic.semitones)
# found.sort(cmp=compare)
return found
def findPotentialPassingTones(show=True):
g = corpus.parse('gloria')
gcn = g.parts['cantus'].measures(1,126).flat.notesAndRests
gcn[0].lyric = ""
gcn[-1].lyric = ""
for i in range(1, len(gcn) - 1):
prev = gcn[i-1]
cur = gcn[i]
nextN = gcn[i+1]
cur.lyric = ""
if ("Rest" in prev.classes or
"Rest" in cur.classes or
"Rest" in nextN.classes):
continue
int1 = interval.notesToInterval(prev, cur)
if int1.isStep is False:
continue
int2 = interval.notesToInterval(cur, nextN)
if int2.isStep is False:
continue
cma = cur.beatStrength
if (cma < 1 and
cma <= prev.beatStrength and
cma <= nextN.beatStrength):
if int1.direction == int2.direction:
cur.lyric = 'pt' # neighbor tone
else:
cur.lyric = 'nt' # passing tone
if show:
g.parts['cantus'].show()
def searchForIntervals(notesStr):
'''
notesStr is the same as above. Now however we check to see
if the generic intervals are the same, rather than the note names.
Useful if the clef is missing.
'''
notesArr = notesStr.split()
noteObjArr = []
for tN in notesArr:
tNObj = note.Note()
tNObj.name = tN[0]
tNObj.octave = int(tN[1])
noteObjArr.append(tNObj)
interObjArr = []
for i in range(len(noteObjArr) - 1):
int1 = interval.notesToInterval(noteObjArr[i], noteObjArr[i + 1])
interObjArr.append(int1)
#print interObjArr
searcher1 = IntervalSearcher(interObjArr)
ballataObj = cadencebook.BallataSheet()
streamOpus = stream.Opus()
for thisWork in ballataObj:
print(thisWork.title)
for thisCadence in thisWork.snippets:
if thisCadence is None:
continue
for i in range(len(thisCadence.parts)):
if searcher1.compareToStream(
thisCadence.parts[i].flat) is True:
notesStr = ""
for thisNote in thisCadence.parts[i].flat.notesAndRests:
#thisNote.editorial.color = "blue"
if thisNote.isRest is False:
notesStr += thisNote.nameWithOctave + " "
else:
notesStr += "r "
streamOpus.insert(0, thisCadence)
# streamLily += "\\score {" + \
# "<< \\time " + str(thisCadence.timeSig) + \
# "\n \\new Staff {" + str(thisCadence.parts[i].lily) + "} >>" + \
# thisCadence.header() + "\n}\n"
print(u"In piece %r found in stream %d: %s" %
(thisWork.title, i, notesStr))
if len(streamOpus) > 0:
streamOpus.show('lily.png')
def ch1_writing_II_A(show=True, *arguments, **keywords):
'''p. 7
Compose a melody using whole and half steps in any musical style.
This technique uses a random walk of whole or half steps with direction
choices determined by whether the present note is above or below the
target end.
'''
import random
from music21 import stream, expressions, pitch
dirWeight = [-1, 1] # start with an even distribution
s = stream.Stream()
nStart = note.Note('g4')
n = copy.deepcopy(nStart)
while True:
# n.quarterLength = random.choice([.25, .5, 1])
n.duration.type = random.choice(['16th', 'eighth', 'quarter'])
s.append(n)
# if we have written more than fifteen notes
# and the last notes matches the first pitch class, then end.
if len(s) > 4 and n.pitch.pitchClass == nStart.pitch.pitchClass:
n.expressions.append(expressions.Fermata())
break
if len(s) > 30: # emergency break in case the piece is too long
break
direction = random.choice(dirWeight)
if direction == 1:
i = random.choice(['w', 'h'])
else:
i = random.choice(['w-', 'h-'])
try:
n = n.transpose(i)
except pitch.AccidentalException:
break # end b/c our transposition have exceeded accidental range
iSpread = interval.notesToInterval(nStart, n)
if iSpread.direction == -1: # we are below our target, favor upward
dirWeight = [-1, 1, 1]
if iSpread.direction == 1: # we are above our target, favor down
dirWeight = [-1, -1, 1]
if show:
s.show()
else:
unused_post = musicxml.m21ToString.fromMusic21Object(s)
def generateTripletBlues(blRealization=None, numRepeats=5): # 12/8
"""
Turns whole notes in twelve bar blues bass line to triplet blues bass line. Takes
in numRepeats, which is the number of times to repeat the bass line. Also, takes in a
realization of :meth:`~music21.figuredBass.examples.twelveBarBlues`. If none is provided,
a default realization with :attr:`~music21.figuredBass.rules.Rules.forbidVoiceOverlap`
set to False and :attr:`~music21.figuredBass.rules.Rules.partMovementLimits` set to
[(1,4),(2,12),(3,12)] is used.
>>> from music21.figuredBass import examples
>>> #_DOCS_SHOW examples.generateTripletBlues(numRepeats = 1).show()
.. image:: images/figuredBass/fbExamples_tripletBlues.*
:width: 700
"""
from music21 import tinyNotation, stream, interval, meter
if blRealization == None:
bluesLine = twelveBarBlues()
fbRules = rules.Rules()
fbRules.partMovementLimits = [(1, 4), (2, 12), (3, 12)]
fbRules.forbidVoiceOverlap = False
blRealization = bluesLine.realize(fbRules)
sampleScore = blRealization.generateRandomRealizations(numRepeats)
tripletBassLine = tinyNotation.TinyNotationStream("BB-4 BB-8 D4 D8 F4 F8 A-8 G8 F8")
newBassLine = stream.Part()
for n in sampleScore[1].notes:
i = interval.notesToInterval(tripletBassLine[0], n)
tp = tripletBassLine.transpose(i)
for lyr in n.lyrics:
tp.notes[0].addLyric(lyr.text)
for m in tp.notes:
newBassLine.append(m)
newTopLine = stream.Part()
for sampleChord in sampleScore[0].notes:
sampleChordCopy = copy.deepcopy(sampleChord)
sampleChordCopy.quarterLength = 6.0
newTopLine.append(sampleChordCopy)
newScore = stream.Score()
newScore.append(meter.TimeSignature("12/8")) # Time signature
newScore.append(sampleScore[1][1]) # Key signature
newScore.insert(0, newTopLine)
newScore.insert(0, newBassLine)
return newScore
def searchForIntervals(notesStr):
'''
notesStr is the same as above. Now however we check to see
if the generic intervals are the same, rather than the note names.
Useful if the clef is missing.
'''
notesArr = notesStr.split()
noteObjArr = []
for tN in notesArr:
tNObj = note.Note()
tNObj.name = tN[0]
tNObj.octave = int(tN[1])
noteObjArr.append(tNObj)
interObjArr = []
for i in range(len(noteObjArr) - 1):
int1 = interval.notesToInterval(noteObjArr[i], noteObjArr[i+1])
interObjArr.append(int1)
#print interObjArr
searcher1 = IntervalSearcher(interObjArr)
ballataObj = cadencebook.BallataSheet()
streamOpus = stream.Opus()
for thisWork in ballataObj:
print(thisWork.title)
for thisCadence in thisWork.snippets:
if thisCadence is None:
continue
for i in range(len(thisCadence.parts)):
if searcher1.compareToStream(thisCadence.parts[i].flat) is True:
notesStr = ""
for thisNote in thisCadence.parts[i].flat.notesAndRests:
#thisNote.editorial.color = "blue"
if thisNote.isRest is False:
notesStr += thisNote.nameWithOctave + " "
else:
notesStr += "r "
streamOpus.insert(0, thisCadence)
# streamLily += "\\score {" + \
# "<< \\time " + str(thisCadence.timeSig) + \
# "\n \\new Staff {" + str(thisCadence.parts[i].lily) + "} >>" + \
# thisCadence.header() + "\n}\n"
print(u"In piece %r found in stream %d: %s" % (thisWork.title, i, notesStr))
if len(streamOpus) > 0:
streamOpus.show('lily.png')
def corpusFindMelodicSevenths(show=True):
# find and display melodic sevenths
import os
from music21.analysis import discrete
mid = discrete.MelodicIntervalDiversity()
groupEast = corpus.search('shanxi', field='locale')
groupWest = corpus.search('niederlande', field='locale')
found = []
for unused_name, group in [('shanxi', groupEast),
('niederlande', groupWest)]:
for fp, n in group:
s = converter.parse(fp, number=n)
intervalDict = mid.countMelodicIntervals(s)
for key in sorted(intervalDict.keys()):
if key in ['m7', 'M7']:
found.append([fp, n, s])
results = stream.Stream()
for fp, num, s in found:
environLocal.printDebug(['working with found', fp, num])
# this assumes these are all monophonic
noteStream = s.flat.getElementsByClass('Note')
for i, n in enumerate(noteStream):
if i <= len(noteStream) - 2:
nNext = noteStream[i + 1]
else:
nNext = None
if nNext is not None:
#environLocal.printDebug(['creating interval from notes:', n, nNext, i])
i = interval.notesToInterval(n, nNext)
environLocal.printDebug(['got interval', i.name])
if i.name in ['m7', 'M7']:
#n.addLyric(s.metadata.title)
junk, fn = os.path.split(fp)
n.addLyric('%s: %s' % (fn, num))
m = noteStream.extractContext(
n, 1, 2, forceOutputClass=stream.Measure)
m.makeAccidentals()
m.timeSignature = m.bestTimeSignature()
results.append(m)
if show == True:
results.show()
def ch1_basic_I_B(show=True, *arguments, **keywords):
"""
p2.
given 2 pitches, mark on a keyboard their positions and mark
intervals as W for whole step and H for half step, otherwise N
"""
pitches = [("a#", "b"), ("b-", "c#"), ("g-", "a"), ("d-", "c##"), ("f", "e"), ("f#", "e")]
for i, j in pitches:
n1 = note.Note(i)
n2 = note.Note(j)
i1 = interval.notesToInterval(n1, n2)
if i1.intervalClass == 1: # by interval class
unused_mark = "H"
elif i1.intervalClass == 2:
unused_mark = "W"
else:
unused_mark = "N"
def generateBoogieVamp(blRealization=None, numRepeats=5):
'''
Turns whole notes in twelve bar blues bass line to blues boogie woogie bass line. Takes
in numRepeats, which is the number of times to repeat the bass line. Also, takes in a
realization of :meth:`~music21.figuredBass.examples.twelveBarBlues`. If none is provided,
a default realization with :attr:`~music21.figuredBass.rules.Rules.forbidVoiceOverlap`
set to False and :attr:`~music21.figuredBass.rules.Rules.partMovementLimits` set to
[(1, 4), (2, 12), (3, 12)] is used.
>>> from music21.figuredBass import examples
>>> #_DOCS_SHOW examples.generateBoogieVamp(numRepeats=1).show()
.. image:: images/figuredBass/fbExamples_boogieVamp.*
:width: 700
'''
from music21 import converter
from music21 import stream
from music21 import interval
if blRealization is None:
bluesLine = twelveBarBlues()
fbRules = rules.Rules()
fbRules.partMovementLimits = [(1, 4), (2, 12), (3, 12)]
fbRules.forbidVoiceOverlap = False
blRealization = bluesLine.realize(fbRules)
sampleScore = blRealization.generateRandomRealizations(numRepeats)
boogieBassLine = converter.parse(
"tinynotation: BB-8. D16 F8. G16 A-8. G16 F8. D16", makeNotation=False)
newBassLine = stream.Part()
newBassLine.append(sampleScore[1][0]) # Time signature
newBassLine.append(sampleScore[1][1]) # Key signature
for n in sampleScore[1].notes:
i = interval.notesToInterval(boogieBassLine[0], n)
tp = boogieBassLine.transpose(i)
for lyr in n.lyrics:
tp.notes.first().addLyric(lyr.text)
for m in tp.notes:
newBassLine.append(m)
newScore = stream.Score()
newScore.insert(0, sampleScore[0])
newScore.insert(newBassLine)
return newScore
def corpusFindMelodicSevenths(show = True):
# find and display melodic sevenths
import os
from music21.analysis import discrete
mid = discrete.MelodicIntervalDiversity()
groupEast = corpus.search('shanxi', field='locale')
groupWest = corpus.search('niederlande', field='locale')
found = []
for unused_name, group in [('shanxi', groupEast), ('niederlande', groupWest)]:
for fp, n in group:
s = converter.parse(fp, number=n)
intervalDict = mid.countMelodicIntervals(s)
for key in sorted(intervalDict.keys()):
if key in ['m7', 'M7']:
found.append([fp, n, s])
results = stream.Stream()
for fp, num, s in found:
environLocal.printDebug(['working with found', fp, num])
# this assumes these are all monophonic
noteStream = s.flat.getElementsByClass('Note')
for i, n in enumerate(noteStream):
if i <= len(noteStream) - 2:
nNext = noteStream[i+1]
else:
nNext = None
if nNext is not None:
#environLocal.printDebug(['creating interval from notes:', n, nNext, i])
i = interval.notesToInterval(n, nNext)
environLocal.printDebug(['got interval', i.name])
if i.name in ['m7', 'M7']:
#n.addLyric(s.metadata.title)
junk, fn = os.path.split(fp)
n.addLyric('%s: %s' % (fn, num))
m = noteStream.extractContext(n, 1, 2, forceOutputClass=stream.Measure)
m.makeAccidentals()
m.timeSignature = m.bestTimeSignature()
results.append(m)
if show == True:
results.show()
def ch1_basic_I_B(show=True, *arguments, **keywords):
'''
p2.
given 2 pitches, mark on a keyboard their positions and mark
intervals as W for whole step and H for half step, otherwise N
'''
pitches = [('a#', 'b'), ('b-', 'c#'), ('g-', 'a'), ('d-', 'c##'),
('f', 'e'), ('f#', 'e')]
for i,j in pitches:
n1 = note.Note(i)
n2 = note.Note(j)
i1 = interval.notesToInterval(n1, n2)
if i1.intervalClass == 1: # by interval class
unused_mark = "H"
elif i1.intervalClass == 2:
unused_mark = "W"
else:
unused_mark = "N"
def generateBoogieVamp(blRealization=None, numRepeats=5):
"""
Turns whole notes in twelve bar blues bass line to blues boogie woogie bass line. Takes
in numRepeats, which is the number of times to repeat the bass line. Also, takes in a
realization of :meth:`~music21.figuredBass.examples.twelveBarBlues`. If none is provided,
a default realization with :attr:`~music21.figuredBass.rules.Rules.forbidVoiceOverlap`
set to False and :attr:`~music21.figuredBass.rules.Rules.partMovementLimits` set to
[(1,4),(2,12),(3,12)] is used.
>>> from music21.figuredBass import examples
>>> #_DOCS_SHOW examples.generateBoogieVamp(numRepeats = 1).show()
.. image:: images/figuredBass/fbExamples_boogieVamp.*
:width: 700
"""
from music21 import tinyNotation, stream, interval
if blRealization == None:
bluesLine = twelveBarBlues()
fbRules = rules.Rules()
fbRules.partMovementLimits = [(1, 4), (2, 12), (3, 12)]
fbRules.forbidVoiceOverlap = False
blRealization = bluesLine.realize(fbRules)
sampleScore = blRealization.generateRandomRealizations(numRepeats)
boogieBassLine = tinyNotation.TinyNotationStream("BB-8. D16 F8. G16 A-8. G16 F8. D16")
newBassLine = stream.Part()
newBassLine.append(sampleScore[1][0]) # Time signature
newBassLine.append(sampleScore[1][1]) # Key signature
for n in sampleScore[1].notes:
i = interval.notesToInterval(boogieBassLine[0], n)
tp = boogieBassLine.transpose(i)
for lyr in n.lyrics:
tp.notes[0].addLyric(lyr.text)
for m in tp.notes:
newBassLine.append(m)
newScore = stream.Score()
newScore.insert(0, sampleScore[0])
newScore.insert(newBassLine)
return newScore
def construct_music21(musicobject):
"""Export a music21 stream from the given musicobject."""
if type(musicobject) == Tone:
if isinstance(musicobject.frequency, float):
n = note.Note()
difference = frequency_to_semitone(musicobject.frequency)
n.transpose(difference, inPlace=True)
elif musicobject.frequency == '_':
n = note.Rest()
else:
n = note.Note()
n.pitch.name = musicobject.frequency
n.duration.quarterLength = musicobject.duration
return n
if type(musicobject) == Group:
compound = stream.Stream()
for sequence in musicobject.sequences:
s = stream.Stream()
for element in sequence:
s.append(construct_music21(element))
compound.insert(0, s)
return compound.flat
if type(musicobject) == Transformed:
subject = construct_music21(musicobject.subject)
T = musicobject.transformation
# Apply duration transformation
if type(musicobject.subject) == Tone:
subject.duration = duration.Duration(subject.duration.quarterLength * T.duration)
else:
subject.scaleDurations(T.duration)
subject.scaleOffsets(T.duration)
# Apply frequency transformation
if isinstance(T.frequency, float):
difference = frequency_to_semitone(T.frequency)
else:
difference = interval.notesToInterval(note.Note('c4'), note.Note(T.frequency))
subject.transpose(difference, inPlace=True)
return subject
def searchForIntervals(notesStr):
'''notesStr is the same as above. Now however we check to see
if the generic intervals are the same, rather than the note names.
Useful if the clef is missing.
'''
notesArr = notesStr.split()
noteObjArr = []
for tN in notesArr:
tNObj = Note()
tNObj.name = tN[0]
tNObj.octave = int(tN[1])
noteObjArr.append(tNObj)
interObjArr = []
for i in range(len(noteObjArr) - 1):
int1 = interval.notesToInterval(noteObjArr[i], noteObjArr[i+1])
interObjArr.append(int1)
#print interObjArr
searcher1 = IntervalSearcher(interObjArr)
ballataObj = cadencebook.BallataSheet()
streamLily = ""
for thisWork in ballataObj:
for thisCadence in thisWork.snippets:
if (thisCadence is None):
continue
for i in range(len(thisCadence.parts)):
if searcher1.compareToStream(thisCadence.parts[i].flat) is True:
notesList = ""
for thisNote in thisCadence.parts[i].flat.notes:
notesList += thisNote.name + " "
#thisNote.editorial.color = "blue"
streamLily += "\\score {" + \
"<< \\time " + str(thisCadence.timeSig) + \
"\n \\new Staff {" + str(thisCadence.parts[i].lily) + "} >>" + \
str(thisCadence.header()) + "\n}\n"
print("In piece %r found in stream %d: %s" % (thisWork.title, i, notesList))
if streamLily:
print(streamLily)
lily.lilyString.LilyString(streamLily).showPDF()
def check_augmented_seconds(voice):
"""Raises an error if the interval between two notes in a voice
is an augmented second.
>>> from music21 import note, stream
>>> soprano = stream.Part(map(note.Note, ['D5', 'E-5', 'F#5']))
>>> bass = stream.Part(map(note.Note, ['B-2', 'G2', 'A2']))
>>> check_augmented_seconds(soprano)
Traceback (most recent call last):
...
errors.AugmentedSecondError: Found augmented second at index 2
>>> check_augmented_seconds(bass)
"""
previous_note = None
for i, current_note in enumerate(voice):
if i > 0:
test_interval = interval.notesToInterval(previous_note, current_note)
if test_interval.name == "A2":
raise AugmentedSecondError(i)
previous_note = current_note
def base40ActualInterval(base40NumA, base40NumB):
'''
Calculates a music21 Interval between two Base40 pitch
numbers, as calculated using the music21.interval module.
Raises a Base40 Exception if (a) Either of the Base40 pitch
numbers does not correspond to a pitch name or (b) If
an unusual interval is encountered that can't be handled
by music21.
>>> musedata.base40.base40ActualInterval(163, 191)
<music21.interval.Interval m6>
>>> musedata.base40.base40ActualInterval(186, 174) #Descending M3
<music21.interval.Interval M-3>
>>> musedata.base40.base40ActualInterval(1, 5)
<music21.interval.Interval AAAA1>
>>> musedata.base40.base40ActualInterval(1, 3)
<music21.interval.Interval AA1>
>>> musedata.base40.base40ActualInterval(2, 6)
Traceback (most recent call last):
music21.musedata.base40.Base40Exception: Pitch name not assigned to this Base40 number 6
OMIT_FROM_DOCS
>>> musedata.base40.base40ActualInterval(12, 6)
Traceback (most recent call last):
music21.musedata.base40.Base40Exception: Pitch name not assigned to this Base40 number 12
'''
pitchA = base40ToPitch(base40NumA)
pitchB = base40ToPitch(base40NumB)
noteA = note.Note()
noteA.pitch = pitchA
noteB = note.Note()
noteB.pitch = pitchB
try:
return interval.notesToInterval(noteA, noteB)
except IndexError:
raise Base40Exception(
'Unusual interval- Limitation of music21.interval')
def iqRootsAndPercentage(analysisStream):
totalDuration = analysisStream.duration.quarterLength
romMerged = analysisStream.flat.stripTies()
major = ""
minor = ""
active = 'minor'
for element in romMerged:
if "RomanNumeral" in element.classes:
#distanceToTonicInSemis = int((element.root().ps -
# pitch.Pitch(element.scale.tonic).ps) % 12)
elementLetter = str(element.root().name)
## leave El
if element.quality == 'minor' or element.quality == 'diminished':
elementLetter = elementLetter.lower()
elif element.quality == 'other':
rootScaleDegree = element.scale.getScaleDegreeFromPitch(
element.root())
if rootScaleDegree:
thirdPitch = element.scale.pitchFromDegree(
(rootScaleDegree + 2) % 7)
int1 = interval.notesToInterval(element.root(), thirdPitch)
if int1.intervalClass == 3:
elementLetter = elementLetter.lower()
else:
pass
longString = elementLetter + " (" + str(
int(element.duration.quarterLength * 10000 / totalDuration) /
100) + ") "
if active == 'major':
major += longString
else:
minor += longString
elif "Key" in element.classes:
if element.mode == 'major':
active = 'major'
major += "\n" + element.tonic + " " + element.mode + " "
else:
active = 'minor'
minor += "\n" + element.tonic + " " + element.mode + " "
return (major, minor)
def base40ActualInterval(base40NumA, base40NumB):
'''
Calculates a music21 Interval between two Base40 pitch
numbers, as calculated using the music21.interval module.
Raises a Base40 Exception if (a) Either of the Base40 pitch
numbers does not correspond to a pitch name or (b) If
an unusual interval is encountered that can't be handled
by music21.
>>> from music21 import *
>>> base40ActualInterval(163,191)
<music21.interval.Interval m6>
>>> base40ActualInterval(186,174) #Descending M3
<music21.interval.Interval M-3>
>>> base40ActualInterval(1,5)
<music21.interval.Interval AAAA1>
>>> base40ActualInterval(1,3)
<music21.interval.Interval AA1>
>>> base40ActualInterval(2,6)
Traceback (most recent call last):
Base40Exception: Pitch name not assigned to this Base40 number 6
OMIT_FROM_DOCS
>>> base40ActualInterval(12,6)
Traceback (most recent call last):
Base40Exception: Pitch name not assigned to this Base40 number 12
'''
pitchA = base40ToPitch(base40NumA)
pitchB = base40ToPitch(base40NumB)
noteA = note.Note()
noteA.pitch = pitchA
noteB = note.Note()
noteB.pitch = pitchB
try:
return interval.notesToInterval(noteA,noteB)
except IndexError:
raise Base40Exception('Unusual interval- Limitation of music21.interval')
def iqRootsAndPercentage(analysisStream):
totalDuration = analysisStream.duration.quarterLength
romMerged = analysisStream.flat.stripTies()
major = ""
minor = ""
active = 'minor'
for element in romMerged:
if "RomanNumeral" in element.classes:
#distanceToTonicInSemis = int((element.root().ps -
# pitch.Pitch(element.scale.tonic).ps) % 12)
elementLetter = str(element.root().name)
## leave El
if element.quality == 'minor' or element.quality == 'diminished':
elementLetter = elementLetter.lower()
elif element.quality == 'other':
rootScaleDegree = element.scale.getScaleDegreeFromPitch(element.root())
if rootScaleDegree:
thirdPitch = element.scale.pitchFromDegree((rootScaleDegree + 2) % 7)
int1 = interval.notesToInterval(element.root(), thirdPitch)
if int1.intervalClass == 3:
elementLetter = elementLetter.lower()
else:
pass
longString = elementLetter + " (" + str(int(
element.duration.quarterLength * 10000 / totalDuration)
/ 100) + ") "
if active == 'major':
major += longString
else:
minor += longString
elif "Key" in element.classes:
if element.mode == 'major':
active = 'major'
major += "\n" + element.tonic + " " + element.mode + " "
else:
active = 'minor'
minor += "\n" + element.tonic + " " + element.mode + " "
return (major, minor)
def isValidStep(self, note11, note12):
'''Determines if the melodic interval between two given notes is "legal"
according to 21M.301 rules of counterpoint.'''
interval1 = interval.notesToInterval(note11, note12)
if interval1.diatonic.name in self.legalMelodicIntervals: return True
else: return False
def generateValidNotes(self, prevFirmus, currFirmus, prevNote, afterLeap, minorScale):
'''Helper function for generateFirstSpecies; gets a list of possible
next notes based on valid melodic intervals, then checks each one so
that parallel/hidden fifths/octaves, voice crossing, and invalid
harmonies are prevented. Adds extra weight to notes that would create
contrary motion.'''
print currFirmus.name
valid = []
bottomInt = interval.notesToInterval(prevFirmus, currFirmus)
if bottomInt.direction < 0: ascending = True
else: ascending = False
n1 = interval.transposeNote(prevNote, "m2")
n2 = interval.transposeNote(prevNote, "M2")
n3 = interval.transposeNote(prevNote, "m3")
n4 = interval.transposeNote(prevNote, "M3")
n5 = interval.transposeNote(prevNote, "P4")
n6 = interval.transposeNote(prevNote, "P5")
if afterLeap: possible = [n1, n2, n3, n4]
else: possible = [n1, n2, n3, n4, n5, n6]
possible.extend(possible)
n7 = interval.transposeNote(prevNote, "m-2")
n8 = interval.transposeNote(prevNote, "M-2")
n9 = interval.transposeNote(prevNote, "m-3")
n10 = interval.transposeNote(prevNote, "M-3")
n11 = interval.transposeNote(prevNote, "P-4")
n12 = interval.transposeNote(prevNote, "P-5")
if afterLeap: possible.extend([n7, n8, n9, n10])
else: possible.extend([n7, n8, n9, n10, n11, n12])
print "possible: ", [note1.name for note1 in possible]
for note1 in possible:
try: validHarmony = self.isValidHarmony(note1, currFirmus)
except: validHarmony = False
# vlq = VoiceLeadingQuartet(prevNote, prevFirmus, note1, currFirmus)
# par5 = vlq.parallelFifth()
# par8 = vlq.parallelOctave()
# hid5 = vlq.hiddenFifth()
# hid8 = vlq.hiddenOctave()
# par1 = vlq.parallelUnison()
try: par5 = self.isParallelFifth(prevNote, note1, prevFirmus, currFirmus)
except: par5 = True
try: par8 = self.isParallelOctave(prevNote, note1, prevFirmus, currFirmus)
except: par8 = True
try: hid5 = self.isHiddenFifth(prevNote, note1, prevFirmus, currFirmus)
except: hid5 = True
try: hid8 = self.isHiddenOctave(prevNote, note1, prevFirmus, currFirmus)
except: hid8 = True
try: par1 = self.isParallelUnison(prevNote, note1, prevFirmus, currFirmus)
except: par1 = True
try:
distance = interval.notesToInterval(currFirmus, note1)
if distance.direction < 0: crossing = True
else: crossing = False
except: crossing = True
goodNotes = minorScale.getConcreteMelodicMinorScale()
goodNames = [note2.name for note2 in goodNotes]
if validHarmony and (not par5) and (not par8) and (not hid5) and\
(not hid8) and (not par1) and (not crossing):
if note1.name in goodNames:
print "adding: ", note1.name, note1.octave
valid.append(note1)
print
return valid
def intervals(notes):
return [notesToInterval(notes[0], y).semiSimpleName for y in notes[1:]]
def capuaRuleTwo(srcStream):
'''
See capuaRuleOne for precise instructions.
Applies Capua's second rule to the given srcStream, i.e. if four notes are
ascending with the pattern M2 m2 M2, the intervals shall be made M2 M2 m2.
Also changes note.style.color for rule 2 (purple purple green purple).
returns the number of times any note was changed
'''
numChanged = 0
ssn = srcStream.flat.notesAndRests
for i in range(len(ssn) - 3):
n1 = ssn[i]
n2 = ssn[i + 1]
n3 = ssn[i + 2]
n4 = ssn[i + 3]
if (n1.isRest or n2.isRest or n3.isRest or n4.isRest):
continue
i1 = interval.notesToInterval(n1, n2)
i2 = interval.notesToInterval(n2, n3)
i3 = interval.notesToInterval(n3, n4)
if (n1.pitch.accidental is not None or n2.pitch.accidental is not None
or n4.pitch.accidental is not None):
continue
# never seems to improve things...
if n3.step == 'A' or n3.step == 'D':
continue
# e.g., D E F G => D E F# G
# or F A Bb C => F A B C
if (i1.directedName == 'M2' and i2.directedName == 'm2'
and i3.directedName == 'M2'):
numChanged += 1
if 'capuaRuleNumber' in n3.editorial:
n3.editorial.capuaRuleNumber += RULE_TWO
else:
n3.editorial.capuaRuleNumber = RULE_TWO
if n3.pitch.accidental is not None and n3.pitch.accidental.name == 'flat':
n3.editorial.savedAccidental = n3.pitch.accidental
n3.pitch.accidental = None
n3.editorial.ficta = pitch.Accidental('natural')
n3.editorial.capuaFicta = pitch.Accidental('natural')
n1.style.color = 'purple'
n2.style.color = 'purple'
n3.style.color = 'ForestGreen'
n4.style.color = 'purple'
else:
n3.editorial.ficta = pitch.Accidental('sharp')
n3.editorial.capuaFicta = pitch.Accidental('sharp')
n1.style.color = 'purple'
n2.style.color = 'purple'
n3.style.color = 'ForestGreen'
n4.style.color = 'purple'
return numChanged
def capuaRuleTwo(srcStream):
'''
See capuaRuleOne for precise instructions.
Applies Capua's second rule to the given srcStream, i.e. if four notes are
ascending with the pattern M2 m2 M2, the intervals shall be made M2 M2 m2.
Also changes note.editorial.color for rule 2 (purple purple green purple).
returns the number of times any note was changed
'''
numChanged = 0
ssn = srcStream.flat.notesAndRests
for i in range(0, len(ssn) - 3):
n1 = ssn[i]
n2 = ssn[i + 1]
n3 = ssn[i + 2]
n4 = ssn[i + 3]
if n1.isRest or \
n2.isRest or \
n3.isRest or \
n4.isRest:
continue
i1 = interval.notesToInterval(n1, n2)
i2 = interval.notesToInterval(n2, n3)
i3 = interval.notesToInterval(n3, n4)
if n1.accidental is not None or \
n2.accidental is not None or \
n4.accidental is not None:
continue
### never seems to improve things...
if n3.step == "A" or n3.step == "D":
continue
# e.g., D E F G => D E F# G
# or F A Bb C => F A B C
if i1.directedName == "M2" and \
i2.directedName == "m2" and \
i3.directedName == "M2":
numChanged += 1
if ("capua" in n3.editorial.misc):
n3.editorial.misc['capua_rule_number'] += RULE_TWO
else:
n3.editorial.misc['capua_rule_number'] = RULE_TWO
if (n3.accidental is not None and n3.accidental.name == "flat"):
n3.editorial.misc["saved-accidental"] = n3.accidental
n3.accidental = None
n3.editorial.ficta = pitch.Accidental("natural")
n3.editorial.misc["capua-ficta"] = pitch.Accidental("natural")
n1.editorial.color = "purple"
n2.editorial.color = "purple"
n3.editorial.color = "ForestGreen"
n4.editorial.color = "purple"
else:
n3.editorial.ficta = pitch.Accidental("sharp")
n3.editorial.misc["capua-ficta"] = pitch.Accidental("sharp")
n1.editorial.color = "purple"
n2.editorial.color = "purple"
n3.editorial.color = "ForestGreen"
n4.editorial.color = "purple"
return numChanged
def findPhraseBoundaries(book=4, madrigal=12):
filename = 'monteverdi/madrigal.%s.%s' % (book, madrigal)
sc = corpus.parse(filename + '.xml')
analysis = corpus.parse(filename + '.rntxt')
analysisFlat = analysis.flat.stripTies().getElementsByClass(
roman.RomanNumeral)
phraseScoresByOffset = {}
for p in sc.parts:
partNotes = p.flat.stripTies(matchByPitch=True).notesAndRests
#thisPartPhraseScores = [] # keeps track of the likelihood that a phrase boundary is after note i
for i in range(
2,
len(partNotes) - 2
): # start on the third note and stop searching on the third to last note...
thisScore = 0
twoNotesBack = partNotes[i - 2]
previousNote = partNotes[i - 1]
thisNote = partNotes[i]
nextNote = partNotes[i + 1]
nextAfterThatNote = partNotes[i + 2]
phraseOffset = nextNote.offset
if phraseOffset in phraseScoresByOffset:
existingScore = phraseScoresByOffset[phraseOffset]
else:
phraseScoresByOffset[phraseOffset] = 0
existingScore = 0
if thisNote.isRest == True:
continue
if nextNote.isRest == True:
thisScore = thisScore + 10
else:
intervalToNextNote = interval.notesToInterval(
thisNote, nextNote)
if intervalToNextNote.chromatic.undirected >= 6: # a tritone or bigger
thisScore = thisScore + 10
if (thisNote.quarterLength > previousNote.quarterLength) and \
(thisNote.quarterLength > nextNote.quarterLength):
thisScore = thisScore + 10
if (thisNote.quarterLength > previousNote.quarterLength) and \
(thisNote.quarterLength > twoNotesBack.quarterLength) and \
(nextNote.quarterLength > nextAfterThatNote.quarterLength):
thisScore = thisScore + 10
previousNoteAnalysis = analysisFlat.getElementAtOrBefore(
previousNote.offset)
thisNoteAnalysis = analysisFlat.getElementAtOrBefore(
thisNote.offset)
if (previousNoteAnalysis.romanNumeral == 'V'
and thisNoteAnalysis.romanNumeral.upper() == 'I'):
thisScore = thisScore + 11
elif (previousNoteAnalysis.romanNumeral.upper() == 'II'
and thisNoteAnalysis.romanNumeral.upper() == 'I'):
thisScore = thisScore + 6
if thisNote.lyric is not None and thisNote.lyric.endswith('.'):
thisScore = thisScore + 15 # would be higher but our lyrics data is bad.
phraseScoresByOffset[phraseOffset] = existingScore + thisScore
flattenedBass = sc.parts[-1].flat.notesAndRests
for thisOffset in sorted(phraseScoresByOffset.keys()):
psbo = phraseScoresByOffset[thisOffset]
if psbo > 0:
print(thisOffset, psbo)
relevantNote = flattenedBass.getElementAtOrBefore(thisOffset - 0.1)
if hasattr(relevantNote, 'score'):
print("adjusting score from %d to %d for note in measure %d" %
(relevantNote.score, relevantNote.score + psbo,
relevantNote.measureNumber))
relevantNote.score += psbo
else:
relevantNote.score = psbo
for n in flattenedBass:
if hasattr(n, 'score'):
n.lyric = str(n.score)
sc.show()
