def transpose_to_all_keys_gen(score: music21.stream.Score, keys: [str]=KEYS) \
-> Generator[music21.stream.Score, None, None]:
for key in keys:
score_key = score.analyze('key')
if score_key.tonic.fullName == key:
yield score
else:
interval = music21.interval.Interval(score_key.tonic,
music21.pitch.Pitch(key))
yield score.transpose(interval)
def transpose(song: m21.stream.Score) -> m21.stream.Score:
key = song.getElementsByClass(m21.stream.Part)[0].getElementsByClass(
m21.stream.Measure)[0][4]
if not isinstance(key, m21.key.Key):
key = song.analyze("key")
if key.mode == "major":
interval = m21.interval.Interval(key.tonic, m21.pitch.Pitch("C"))
elif key.mode == "minor":
interval = m21.interval.Interval(key.tonic, m21.pitch.Pitch("A"))
return song.transpose(interval)
def get_key(score: music21.stream.Score) -> str:
return score.analyze('key').tonic.fullName