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Turning in project toolbox #18

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Turning in project toolbox #18

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46 changes: 44 additions & 2 deletions blues_solo.py
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Original file line number Diff line number Diff line change
Expand Up @@ -13,7 +13,7 @@ def add_note(out, instr, key_num, duration, bpm, volume):
duration: the duration of the note in beats
bpm: the tempo of the music
volume: the volume of the note
"""
"""
freq = (2.0**(1/12.0))**(key_num-49)*440.0
stream = instr.play(duration*(60.0/bpm),freq)
stream *= volume
Expand All @@ -23,6 +23,47 @@ def add_note(out, instr, key_num, duration, bpm, volume):
sampling_rate = 44100.0
Wavefile.setDefaults(sampling_rate, 16)

bass = GuitarBass(sampling_rate) # use a guitar bass as the instrument
solo = AudioStream(sampling_rate, 1)

""" these are the piano key numbers for a 3 octave blues scale in A
See: http://en.wikipedia.org/wiki/Blues_scale """
blues_scale = [25, 28, 30, 31, 32, 35, 37, 40, 42, 43, 44, 47, 49, 52, 54, 55, 56, 59, 61]
beats_per_minute = 45 # Let's make a slow blues solo
time = [0.5, 0.8, 0.9, 1.2, 1.5] # add random swing
volume = [0.5, 0.8, 1.0, 2.0, 2.5, 3.0, 5.0] # add random dynamics

""" initial conditions """
curr_note = 12
roots = [0,6,12,18]
add_note(solo, bass, blues_scale[curr_note], 1.0, beats_per_minute, 1.0)

licks = [ [ [3,choice(time)], [-2,choice(time)], [-4,choice(time)], [2,choice(time)], [3,choice(time)] ],
[ [1,choice(time)], [4,choice(time)], [-2,choice(time)], [1,choice(time)], [1,choice(time)] ],
[ [-1,choice(time)], [2,choice(time)], [-1,choice(time)], [2,choice(time)], [-1,choice(time)] ],
[ [2,choice(time)], [-1,choice(time)], [-1,choice(time)],[-1,choice(time)], [2,choice(time)] ] ]

for i in range(20):
lick = choice(licks)
for note in lick:
curr_note += note[0]
if curr_note < 0 or curr_note > len(blues_scale) - 1: # keep in index of blues_scale
curr_note = choice(roots)
add_note(solo, bass, blues_scale[curr_note], note[1], beats_per_minute, choice(volume))

""" Make it cooler-- adding a backing track and mixing various audio streams """
backing_track = AudioStream(sampling_rate, 1)
Wavefile.read('backing.wav', backing_track)

m = Mixer()

solo *= 0.4 # adjust volumes

m.add(2.25, 0, solo) # delay solo to sync with backing track
m.add(0, 0, backing_track)

m.getStream(500.0) >> "slow_blues.wav" # change from blues_solo.wav to slow_blues.wav

bass = GuitarBass(sampling_rate) # use a guitar bass as the instrument
solo = AudioStream(sampling_rate, 1)

Expand All @@ -33,4 +74,5 @@ def add_note(out, instr, key_num, duration, bpm, volume):

add_note(solo, bass, blues_scale[0], 1.0, beats_per_minute, 1.0)

solo >> "blues_solo.wav"
solo >> "blues_solo.wav"