def cycle36_a_harmonic_minor_test():
sc = scale.HarmonicMinorScale('A')
tonic_triad = chord.Chord(sc.pitchesFromScaleDegrees([1, 3, 5], 'A4',
'G5'))
cycle = generate_cycle_pair(sc, tonic_triad, "3/6")
cycle.insert(0, key.KeySignature(0))
cycle.show()
def resolveDiminishedSeventhSegment(self, segmentB, doubledRoot = False):
'''
Can resolve a Segment whose :attr:`~music21.figuredBass.segment.Segment.segmentChord`
spells out a diminished seventh chord. If no applicable method in
:mod:`~music21.figuredBass.resolution` can be used, the Segment is resolved
as an ordinary Segment.
>>> from music21.figuredBass import segment
>>> from music21 import note
>>> segmentA = segment.Segment(bassNote = note.Note('B2'), notationString = "b7")
>>> allDimPossib = segmentA.allCorrectSinglePossibilities()
>>> allDimPossibList = list(allDimPossib)
>>> len(allDimPossibList)
7
>>> [p.nameWithOctave for p in allDimPossibList[4]]
['D5', 'A-4', 'F4', 'B2']
>>> [p.nameWithOctave for p in allDimPossibList[6]]
['A-5', 'F5', 'D5', 'B2']
>>> segmentB = segment.Segment(bassNote = note.Note('C3'), notationString = "")
>>> dimResPairs = segmentA.resolveDiminishedSeventhSegment(segmentB)
>>> dimResPairsList = list(dimResPairs)
>>> len(dimResPairsList)
7
>>> dimResPairsList[4]
((<...D5>, <...A-4>, <...F4>, <...B2>), (<...E5>, <...G4>, <...E4>, <...C3>))
>>> dimResPairsList[6]
((<...A-5>, <...F5>, <...D5>, <...B2>), (<...G5>, <...E5>, <...E5>, <...C3>))
'''
dimChord = self.segmentChord
if not dimChord.isDiminishedSeventh():
#Put here for stand-alone purposes.
raise SegmentException("Diminished seventh resolution: Not a diminished seventh Segment.")
dimChordInfo = _unpackSeventhChord(dimChord)
dimScale = scale.HarmonicMinorScale().deriveByDegree(7, dimChord.root())
#minorScale = dimScale.getParallelMinor()
tonic = dimScale.getTonic()
subdominant = dimScale.pitchFromDegree(4)
resChord = segmentB.segmentChord
if dimChord.inversion() == 1: #Doubled root in context
if resChord.inversion() == 0:
doubledRoot = True
elif resChord.inversion() == 1:
doubledRoot = False
diminishedResolutionMethods = \
[(resChord.root().name == tonic.name and resChord.isMajorTriad(), resolution.diminishedSeventhToMajorTonic, [doubledRoot, dimChordInfo]),
(resChord.root().name == tonic.name and resChord.isMinorTriad(), resolution.diminishedSeventhToMinorTonic, [doubledRoot, dimChordInfo]),
(resChord.root().name == subdominant.name and resChord.isMajorTriad(), resolution.diminishedSeventhToMajorSubdominant, [dimChordInfo]),
(resChord.root().name == subdominant.name and resChord.isMinorTriad(), resolution.diminishedSeventhToMinorSubdominant, [dimChordInfo])]
try:
return self._resolveSpecialSegment(segmentB, diminishedResolutionMethods)
except SegmentException:
self._environRules.warn("Diminished seventh resolution: No proper resolution available. Executing ordinary resolution.")
return self._resolveOrdinarySegment(segmentB)
def testDeriveByDegree(self):
sc1 = scale.MajorScale()
self.assertEqual(str(sc1.deriveByDegree(7, 'G#')),
'<music21.scale.MajorScale A major>')
sc1 = scale.HarmonicMinorScale()
# what scale has g# as its 7th degree
self.assertEqual(
str(sc1.deriveByDegree(7, 'G#')),
'<music21.scale.HarmonicMinorScale A harmonic minor>')
self.assertEqual(
str(sc1.deriveByDegree(2, 'E')),
'<music21.scale.HarmonicMinorScale D harmonic minor>')
def cycle36_drop2_a_harmonic_minor_test():
sc = scale.HarmonicMinorScale('A')
# tonic_triad = chord.Chord(sc.pitchesFromScaleDegrees([1, 3, 5], 'A4', 'G5'))
triad_root = pitch.Pitch("A4")
tonic_triad = chord.Chord(
[triad_root,
triad_root.transpose(7),
triad_root.transpose(15)])
cycle = generate_cycle_pair(sc,
tonic_triad,
"3/6",
voicing_type=Voicing.Drop2_A_form)
cycle.insert(0, key.KeySignature(0))
cycle.show()
def get_seed(self):
"""
Generates a seed based on the configuration file. Four main types are used:
'from_existing' - takes a seed from an existing MIDI file. A specific amount of time steps is extracted,
based on a parameter from the config file.
'from_scale' - creates a seed from a specific scale ('major', 'minor' or 'harmonic_minor'). It randomises
which notes will be taken for the seed.
'custom' - asks the user for a custom seed sequence. Notes have to be entered in a MIDI representation.
'from_random_file' - takes a random file from the data_dir that is set in the configuration file.
:return: a seed sequence
"""
settings = DataHandler.get_config_params()
seed = []
mode = settings["seed_mode"]
if mode == 'from_existing':
seed_source = self.get_note_rep_array(
settings["data_dir"] + settings["seed_source"], False)
for i in range(settings["seed_size"]):
seed.append(seed_source[i][0])
if mode == 'from_scale':
seed_scale = settings["seed_scale"]
if seed_scale == 'major':
sc = scale.MajorScale()
seed = self.get_notes_from_scale(scale_obj=sc,
length=settings["seed_size"])
if seed_scale == 'minor':
sc = scale.MinorScale()
seed = self.get_notes_from_scale(scale_obj=sc,
length=settings["seed_size"])
if seed_scale == 'harmonic_minor':
sc = scale.HarmonicMinorScale()
seed = self.get_notes_from_scale(scale_obj=sc,
length=settings["seed_size"])
if mode == 'custom':
seed_input = input(
"Please enter seed sequence (comma separated sequence of notes in MIDI representation):"
)
seed = [int(i) for i in seed_input]
if mode == 'from_random_file':
files = os.listdir(settings["data_dir"])
file_index = np.random.randint(0, len(files))
seed_source = self.get_note_rep_array(
settings["data_dir"] + files[file_index], False)
for i in range(settings["seed_size"]):
seed.append(seed_source[i][0])
return seed
def generate_examples():
output_dir = ".\\Examples\\"
# Example 1 - cycle 2/7 for C major
sc = scale.MajorScale('C')
tonic_triad = chord.Chord(sc.pitchesFromScaleDegrees([1, 3, 5], 'C5',
'B5'))
cycle = generate_cycle_pair(sc, tonic_triad, "2/7")
cycle.insert(0, key.KeySignature(0))
cycle.metadata = metadata.Metadata()
cycle.metadata.title = "Example 1 - Cycle 2/7 in C Major"
cycle.write("MusicXML", output_dir + "Example 1")
# Example 2 - cycle 4/5 for D major
sc = scale.MajorScale('D')
tonic_triad = chord.Chord(sc.pitchesFromScaleDegrees([1, 3, 5], 'D4',
'C5'))
cycle = generate_cycle_pair(sc, tonic_triad, "4/5")
cycle.insert(0, key.KeySignature(2))
cycle.metadata = metadata.Metadata()
cycle.metadata.title = "Example 2 - Cycle 4/5 in D Major"
cycle.write("MusicXML", output_dir + "Example 2")
# Example 3 - cycle 3/6 for A harmonic minor
sc = scale.HarmonicMinorScale('A')
tonic_triad = chord.Chord(sc.pitchesFromScaleDegrees([1, 3, 5], 'A4',
'G5'))
cycle = generate_cycle_pair(sc, tonic_triad, "3/6")
cycle.insert(0, key.KeySignature(0))
cycle.metadata = metadata.Metadata()
cycle.metadata.title = "Example 3 - Cycle 3/6 in A Harmonic Minor"
cycle.write("MusicXML", output_dir + "Example 3")
# Example 4 - cycle 3/6 for C major but with drop 2 chords
tonic = 'C'
sc = scale.MajorScale(tonic)
root = sc.pitchFromDegree(1)
tonic_triad = chord.Chord([root, root.transpose(7), root.transpose(16)])
cycle = generate_cycle_pair(sc,
tonic_triad,
"3/6",
voicing_type=Voicing.Drop2_A_form)
cycle.insert(0, key.KeySignature(0))
cycle.metadata = metadata.Metadata()
cycle.metadata.title = "Example 4 - Cycle 3/6 in C Major\nDrop 2 voicings"
cycle.write("MusicXML", output_dir + "Example 4")
def testScales01(self):
from music21 import pitch
#==== "fig-py01"
# Providing a tonic makes this concrete
sc1 = scale.MajorScale('g4')
sc2 = scale.MajorScale('e-3')
# Comparing Concrete and Abstract Scales
assert (sc1 == sc2) == False
assert (sc1.abstract == sc2.abstract) == True
# Without arguments, getPitches() returns a single span
assert common.pitchList(
sc1.getPitches()) == '[G4, A4, B4, C5, D5, E5, F#5, G5]'
assert common.pitchList(sc2.getPitches(
'c2', 'c3')) == '[C2, D2, E-2, F2, G2, A-2, B-2, C3]'
# As a Chord, Scale pitches gain additional functionality
assert sc1.getChord().forteClass == '7-35'
# Given a degree, get the pitch
assert str(sc1.pitchFromDegree(5)) == 'D5'
assert common.pitchList(
sc2.pitchesFromScaleDegrees([7, 2], 'e-6',
'e-9')) == '[F6, D7, F7, D8, F8, D9]'
# Get a scale degree from a pitch
assert sc1.getScaleDegreeFromPitch('d') == 5
assert sc2.getScaleDegreeFromPitch('d') == 7
# Get the next pitch given step directions
match = [pitch.Pitch('g2')]
for direction in [1, 1, 1, -2, 4, -1, 1, 1, 1]:
# Append the next pitch based on the last-added pitch
match.append(sc1.next(match[-1], direction))
assert common.pitchList(
match), '[G2, A2, B2, C3, A2, E3, D3, E3, F#3, G3]'
# Derive new scales based on a provided collection or degree
assert str(sc1.derive(['c4', 'g4', 'b8',
'f2'])) == '<music21.scale.MajorScale C major>'
assert str(sc1.deriveByDegree(
7, 'C#')) == '<music21.scale.MajorScale D major>'
# Methods unique to DiatonicScale subclasses
assert str(
sc2.getRelativeMinor()) == '<music21.scale.MinorScale C minor>'
#==== "fig-py01" end
#==== "fig-py02"
sc1 = scale.PhrygianScale('g4')
assert common.pitchList(
sc1.getPitches()) == '[G4, A-4, B-4, C5, D5, E-5, F5, G5]'
assert str(
sc1.getRelativeMajor()) == '<music21.scale.MajorScale E- major>'
assert str(sc1.getTonic()), str(sc1.getDominant()) == ('G4', 'D5')
sc2 = scale.HypodorianScale('a6')
assert common.pitchList(sc2.getPitches(
'e2', 'e3')) == '[E2, F#2, G2, A2, B2, C3, D3, E3]'
assert str(
sc2.getRelativeMajor()) == '<music21.scale.MajorScale G major>'
assert str(sc2.getTonic()), str(sc2.getDominant()) == ('A6', 'C7')
#==== "fig-py02" end
#==== "fig-py06"
# see below
#==== "fig-py06" end
#==== "fig-py03"
#print('\n\nfig-py03')
sc1 = scale.HarmonicMinorScale('a3')
assert common.pitchList(
sc1.getPitches()) == '[A3, B3, C4, D4, E4, F4, G#4, A4]'
assert str(sc1.getTonic()), str(sc1.getDominant()) == ('A3', 'E4')
s = stream.Stream()
for d in [1, 3, 2, 1, 6, 5, 8, 7, 8]:
s.append(
note.Note(sc1.pitchFromDegree(d, equateTermini=False),
type='eighth'))
#s.show()
#==== "fig-py03" end
#==== "fig-py04"
import random
sc1 = scale.MelodicMinorScale('c4')
assert common.pitchList(sc1.getPitches(
direction='ascending')) == '[C4, D4, E-4, F4, G4, A4, B4, C5]'
assert common.pitchList(
sc1.getPitches('c3', 'c5', direction='descending')) == (
'[C5, B-4, A-4, G4, F4, E-4, D4, ' +
'C4, B-3, A-3, G3, F3, E-3, D3, C3]')
assert str(sc1.getTonic()), str(sc1.getDominant()) == ('C4', 'G4')
s = stream.Stream()
p = None
for i in range(8): # was 16, but sometimes exceeded scale length.
direction = random.choice([-1, 1])
for j in range(2):
p = sc1.next(p, direction)
s.append(note.Note(p, quarterLength=.25))
#s.show()
#==== "fig-py04" end
#==== "fig-py05"
sc1 = scale.OctatonicScale('e3', 'm2')
assert common.pitchList(
sc1.getPitches()) == '[E3, F3, G3, A-3, B-3, C-4, D-4, D4, E4]'
sc2 = scale.OctatonicScale('e3', 'M2')
assert common.pitchList(
sc2.getPitches()) == '[E3, F#3, G3, A3, B-3, C4, D-4, E-4, F-4]'
part1 = stream.Part()
part2 = stream.Part()
durPart1 = [1, 1, 0.5, 0.5, 1]
durPart2 = [3, 1]
degrees = list(range(1, 9))
for unused in range(4):
random.shuffle(degrees)
random.shuffle(durPart1)
random.shuffle(durPart2)
i = 0
for dur in durPart1:
part1.append(
note.Note(sc2.pitchFromDegree(degrees[i]),
quarterLength=dur))
i += 1
for dur in durPart2:
part2.append(
note.Note(sc2.pitchFromDegree(degrees[i],
minPitch='c2',
maxPitch='c3'),
quarterLength=dur))
i += 1
s = stream.Score()
s.insert(0, part1)
s.insert(0, part2)
#s.show()
# add notation example; perhaps create tri-chords from scale-completing selections
#==== "fig-py05" end
#sc = scale.SieveScale('c2', '(-3@2 & 4) | (-3@1 & 4@1) | (3@2 & 4@2) | (-3 & 4@3)')
#==== "fig-py07"
# add examples
sc1 = scale.SieveScale('c4', '3@0|4@0')
self.assertEqual(common.pitchList(sc1.getPitches()),
'[C4, E-4, E4, F#4, G#4, A4, C5]')
sc2 = scale.SieveScale('c4', '5@0|7@0')
self.assertEqual(
common.pitchList(sc2.getPitches()),
'[C4, F4, G4, B-4, D5, E-5, G#5, A5, C#6, E6, F#6, B6]')
s = stream.Stream()
pColection = sc2.getPitches('c3', 'c7')
random.shuffle(pColection)
for p in pColection:
s.append(note.Note(p, type='16th'))
#s.show()
#==== "fig-py07" end
#==== "fig-py08"
sc1 = scale.RagAsawari('g3')
self.assertEqual(
common.pitchList(sc1.getPitches(direction='ascending')),
'[G3, A3, C4, D4, E-4, G4]')
self.assertEqual(
common.pitchList(sc1.getPitches(direction='descending')),
'[G4, F4, E-4, D4, C4, B-3, A3, G3]')
sc2 = scale.RagMarwa('g3')
assert common.pitchList(sc2.getPitches(direction='ascending')
) == '[G3, A-3, B3, C#4, E4, F#4, E4, G4, A-4]'
assert common.pitchList(
sc2.getPitches(direction='descending'
)) == '[A-4, G4, A-4, F#4, E4, C#4, B3, A-3, G3]'
p1 = None
s = stream.Stream()
for direction in ([1] * 10) + ([-1] * 8) + ([1] * 4) + ([-1] *
3) + ([1] * 4):
p1 = sc1.next(p1, direction)
s.append(note.Note(p1, quarterLength=.25))
#s.show()
p1 = None
s = stream.Stream()
for direction in ([1] * 10) + ([-1] * 8) + ([1] * 4) + ([-1] *
3) + ([1] * 4):
p1 = sc2.next(p1, direction)
s.append(note.Note(p1, quarterLength=.25))
#s.show()
#==== "fig-py08" end
#==== "fig-py09"
#import random
sc1 = scale.WeightedHexatonicBlues('c3')
p = 'c3'
s = stream.Stream()
for n in range(32):
p = sc1.next(p, random.choice([-1, 1]))
n = note.Note(p, quarterLength=random.choice([.5, .25, .25]))
s.append(n)
