def play_micro_divisions(divs):
"""
Plays one octave of microtones quantized to 1/divs semitones.
Parameters
----------
divs : int 1 to 16
A value of 1 produces 1/1 = 1 = 100 cents (standard semitonal tuning)
a value of 2 produces 1/2 = .5 = 50 cents (quarter tone tuning) and so on.
"""
def playmicro(score, key, rhy, divs):
inc = 1 / divs
for i in range(12 * divs + 1):
note = Note(time=score.now, duration=rhy, pitch=key)
score.add(note)
key += inc
yield rhy
# divs can be a value from 1 to 16
track0 = MidiFile.metatrack(microdivs=divs)
track1 = Seq()
score = Score(out=track1)
score.compose(playmicro(score, 60, .5, divs))
file = MidiFile("microdivs.mid", [track0, track1]).write()
print(f"Wrote '{file.pathname}'.")
def play_micro_pentatonic():
"""
Plays a lovely microtonal pentatonic scale consisting of the prime
numbered harmonics in the 5th octave of the harmonic series:
Harmonic number: 17 19 23 29 31 34
Nearest pitch: C# D# F# A# B C#
Cent adjustment: +5 -3 +28 +29 +45 +5
"""
# the harmonic numbers
harms = [17, 19, 23, 29, 31, 34]
# convert into ascending intervals of a one octave pentatonic scale
penta = deltas(temper(divide(harms, 17)))
#penta = scale(5*4, 60, deltas(semis))
# It's good practice to add any metadata such as tempo, midi instrument
# assignments, micro tuning, etc. to track 0 in your midi file.
track0 = MidiFile.metatrack(ins={i: Vibraphone
for i in range(16)},
microdivs=8)
# Track 1 will hold the composition.
track1 = Seq()
# Create a score and give it tr1 to hold the score event data.
score = Score(out=track1)
def playpenta(score, num, dur, amp, keys):
pat = jumble(keys)
for _ in range(num):
k = next(pat)
n = Note(time=score.now, duration=dur * 2, pitch=k, amplitude=amp)
score.add(n)
yield odds(.2, 0, dur)
top = playpenta(score, 90, .3, .4, scale(72 + 12, 10, *penta))
bot = playpenta(score, 45, .6, .5, scale(48, 10, *penta))
low = playpenta(score, 23, 1.2, .8, scale(24, 10, *penta))
score.compose([top, [.3 * 4, bot], [.3 * 12, low]])
# Write a midi file with our track data.
file = MidiFile("micropenta.mid", [track0, track1]).write()
print(f"Wrote '{file.pathname}'.")
prefers motive2 over motive1.
"""
for i in range(numtimes):
if odds(qtime(i, numtimes, 1.0, 0.0, .01)):
score.compose(motive1(score, between(lowoctave, highoctave), limit, chan))
else:
score.compose(motive2(score, between(lowoctave, highoctave), limit, chan))
yield qtime(i, numtimes, hiwait, lowwait, .2)
if __name__ == '__main__':
# It's good practice to add any metadata such as tempo, midi instrument
# assignments, micro tuning, etc. to track 0 in your midi file.
track0 = MidiFile.metatrack(ins={0: AcousticGrandPiano, 1: Marimba, 2: OrchestralHarp})
# Track 1 will hold the composition.
track1 = Seq()
# Create a score and give it tr1 to hold the score event data.
score = Score(out=track1)
#play = motive1(q, 5, 4, 0)
#play = motive2(q, 5,5,1)
#play = gesture1(q, 10, .5, 0)
#play = gesture2(q, 10, .5, 5, 0)
#play = gesture3(q, 20, .5, 5, 0, 3, .2)
#play = gesture4(q, 30, 2, 7, 11, 0, 1.6,.2)
# The gesture to play
play = [gesture4(score, 60, 2, 7, 11, 0, 1.0, .2),
gesture4(score, 40, 5, 7, 11, 1, 1.6, .2),
gesture4(score, 34, 3, 6, 11, 2, 2.0, .2)]
# Create the composition.