def analyze_7th_chord(chord):
"""
:param chord:
:return: chord_notes, chord_type_full, chord_modes
Example:
>>> chord_notes, chord_type_full, results = analyze_chord("G7")
>>> for chord_degree, key, harmonic_func_full in results:
... print("{} (comprising {}) is a {} chord ({}) of the key of {}".format(chord_type_full,', '.join(chord_notes),
... chord_degree, harmonic_func_full,
... key))
G dominant seventh (comprising G, B, D, F) is a V chord (dominant seventh) of the key of C
"""
chord_notes = chords.from_shorthand(chord)
chord_type_full = chords.determine_seventh(chord_notes)[0]
chord_type_short = chords.determine_seventh(chord_notes, shorthand=True)[0]
type_key = (
"M7"
if chord_type_short[-2:] == "M7"
else ("m7" if chord_type_short[-2:] == "m7" else ("m7b5" if chord_type_short[-2:] == "m7b5" else "7"))
)
chord_modes = []
for key in CIRCLE_OF_5THS:
harmonic_func = determine(chord_notes, key, shorthand=True)[0]
harmonic_func_full = determine(chord_notes, key, shorthand=False)[0]
chord_degree = harmonic_func[:-1]
if chord_degree in MODE_CHORD_TYPE:
func_chord_type = MODE_CHORD_TYPE[chord_degree]
if func_chord_type == type_key:
chord_modes.append((chord_degree, key, harmonic_func_full))
return chord_notes, chord_type_full, chord_modes
def analyze_7th_chord(chord):
"""
:param chord:
:return: chord_notes, chord_type_full, chord_modes
Example:
>>> chord_notes, chord_type_full, results = analyze_chord("G7")
>>> for chord_degree, key, harmonic_func_full in results:
... print("{} (comprising {}) is a {} chord ({}) of the key of {}".format(chord_type_full,', '.join(chord_notes),
... chord_degree, harmonic_func_full,
... key))
G dominant seventh (comprising G, B, D, F) is a V chord (dominant seventh) of the key of C
"""
chord_notes = chords.from_shorthand(chord)
chord_type_full = chords.determine_seventh(chord_notes)[0]
chord_type_short = chords.determine_seventh(chord_notes, shorthand=True)[0]
type_key = 'M7' if chord_type_short[-2:] == 'M7' else (
'm7' if chord_type_short[-2:] == 'm7' else
('m7b5' if chord_type_short[-2:] == 'm7b5' else '7'))
chord_modes = []
for key in CIRCLE_OF_5THS:
harmonic_func = determine(chord_notes, key, shorthand=True)[0]
harmonic_func_full = determine(chord_notes, key, shorthand=False)[0]
chord_degree = harmonic_func[:-1]
if chord_degree in MODE_CHORD_TYPE:
func_chord_type = MODE_CHORD_TYPE[chord_degree]
if func_chord_type == type_key:
chord_modes.append((chord_degree, key, harmonic_func_full))
return chord_notes, chord_type_full, chord_modes
def twelve_bar_blues_chord_progression(key):
from mingus.core.harmony import MODE_CHORD_FUNCTIONS
key_notes = get_notes(key)
aChord = chords.create_dominant_seventh_symbol(key)
bChord = chords.create_dominant_seventh_symbol(key_notes[3])
cChord = chords.determine_seventh(MODE_CHORD_FUNCTIONS[1](key), shorthand=True)[0]
dChord = chords.determine_seventh(MODE_CHORD_FUNCTIONS[4](key), shorthand=True)[0]
return [aChord, bChord, aChord, aChord,
bChord, bChord, aChord, aChord,
cChord, dChord, aChord, aChord]
def reharmonize_v_to_ii_v(chord):
chord_notes, chord_type_full, chord_modes = analyze_chord(chord)
assert len(chord_modes) == 1
chord_degree, key, harmonic_func_full = chord_modes[0]
ii_chord_type_short = chords.determine_seventh(chords.ii7(key),
shorthand=True)[0]
return [ii_chord_type_short, chord]
def test_determine_seventh_shorthand(self): self.chordsTest([ [["Am7", "CM6", "CM|Am"], ["A", "C", "E", "G"]],\ [["CM7", "Em|CM"], ["C", "E", "G", "B"]],\ [["CM7"], ["E", "G", "B", "C"]],\ [["Fm/M7", "Abaug|Fm"], ["F", "Ab", "C", "E"]]], lambda x: chords.determine_seventh(x, True), "proper naming")
def test_determine_seventh_shorthand(self):
self.chordsTest([[['Am7', 'CM6', 'CM|Am'], ['A', 'C', 'E', 'G']],
[['CM7', 'Em|CM'], ['C', 'E', 'G', 'B']],
[['CM7'], ['E', 'G', 'B', 'C']],
[['Fm/M7', 'Abaug|Fm'], ['F', 'Ab', 'C', 'E']]],
lambda x: chords.determine_seventh(x, True),
'proper naming')
def test_determine_seventh_shorthand(self):
self.chordsTest(
[
[["Am7", "CM6", "CM|Am"], ["A", "C", "E", "G"]],
[["CM7", "Em|CM"], ["C", "E", "G", "B"]],
[["CM7"], ["E", "G", "B", "C"]],
[["Fm/M7", "Abaug|Fm"], ["F", "Ab", "C", "E"]],
],
lambda x: chords.determine_seventh(x, True),
"proper naming",
)
def create_seventh_name(note):
return chords.determine_seventh(chords.seventh(note, note),
shorthand=True)[0]
for chord in args.chords:
ii_chord_type_short, chord = reharmonize_v_to_ii_v(chord)
print("II-V ({}, {})".format(ii_chord_type_short, chord))
elif args.action == 'ii_v_tritone_substitution':
for chord in args.chords:
chord_notes = chords.from_shorthand(chord)
new_note = reduce_accidentals(tritone(chord_notes[0]))
new_chord = new_note + '7'
ii_chord_type_short, chord = reharmonize_v_to_ii_v(new_chord)
print("{} {}".format(ii_chord_type_short, new_chord))
elif args.action == 'chord_modes':
chords = [
chords.determine_seventh(mode_func(args.key), shorthand=True)[0]
for mode_func in MODE_CHORD_FUNCTIONS
]
print(', '.join(chords))
elif args.action == '12_bar_blues':
for four_bars in twelve_bar_blues(args.key):
print('\t'.join(four_bars))
elif args.action == 'blues_scale':
print("{} blues scale: {}".format(args.key,
', '.join(blues_scale(args.key))))
elif args.action == '12_bar_blues_printout':
from mingus.containers.note import QuarterNoteFactory as Q
from mingus.core.chords import WholNoteChordFactory as WNC
def reharmonize_v_to_ii_v(chord):
chord_notes, chord_type_full, chord_modes = analyze_chord(chord)
assert len(chord_modes) == 1
chord_degree, key, harmonic_func_full = chord_modes[0]
ii_chord_type_short = chords.determine_seventh(chords.ii7(key), shorthand=True)[0]
return [ii_chord_type_short, chord]
def create_seventh_name(note):
return chords.determine_seventh(chords.seventh(note, note), shorthand=True)[0]
elif args.action == 'reharmonize_v_to_ii_v':
for chord in args.chords:
ii_chord_type_short, chord = reharmonize_v_to_ii_v(chord)
print("II-V ({}, {})".format(ii_chord_type_short, chord))
elif args.action == 'ii_v_tritone_substitution':
for chord in args.chords:
chord_notes = chords.from_shorthand(chord)
new_note = reduce_accidentals(tritone(chord_notes[0]))
new_chord = new_note + '7'
ii_chord_type_short, chord = reharmonize_v_to_ii_v(new_chord)
print("{} {}".format(ii_chord_type_short, new_chord))
elif args.action == 'chord_modes':
chords = [chords.determine_seventh(mode_func(args.key), shorthand=True)[0]
for mode_func in MODE_CHORD_FUNCTIONS]
print(', '.join(chords))
elif args.action == '12_bar_blues':
for four_bars in twelve_bar_blues(args.key):
print('\t'.join(four_bars))
elif args.action == 'blues_scale':
print("{} blues scale: {}".format(args.key, ', '.join(blues_scale(args.key))))
elif args.action == '12_bar_blues_printout':
from mingus.containers.note import QuarterNoteFactory as Q
from mingus.core.chords import WholNoteChordFactory as WNC
blues_scale = Blues(args.key)
bar = Bar()
def test_determine_seventh_shorthand(self):
self.chordsTest([[['Am7', 'CM6', 'CM|Am'], ['A', 'C', 'E', 'G']],
[['CM7', 'Em|CM'], ['C', 'E', 'G', 'B']], [['CM7'], ['E'
, 'G', 'B', 'C']], [['Fm/M7', 'Abaug|Fm'], ['F', 'Ab',
'C', 'E']]], lambda x: chords.determine_seventh(x,
True), 'proper naming')
