learnmusic.py

learnmusic.py

#! python2

# NOTE: The first line in this script specifies that it should always be run using Python 2.7.
# The `midiutil` module is currently not available for Python 3.

'''Generates a MIDI file with 12 random notes in C major, using the midiutil module. The instrument is also picked randomly. The result is then played with the sound.MIDIPlayer class.
If nothing happens, make sure that your device isn't muted.
'''

from midiutil.MidiFile import MIDIFile
from random import choice, randint
import sound
import numpy as np

## Configure a MIDI file with one track:
degrees  = [60, 62, 64, 65, 67, 69, 71, 72]
  # MIDI note number

track    = 1
channel  = 2
time     = 0    # In beats
duration = 1    # In beats
tempo    = 120   # In BPM
volume   = 100  # 0-127, as per the MIDI standard

midi = MIDIFile(1)  # One track
midi.addTempo(track, time, tempo)


## Select the instrument:
program = 1 #piano
# tracknum, channel, time, program
midi.addProgramChange(0, 0, 0, program)


# def chord
def chord(base, type, pitch_list, pitch_range=5):
	base_list=[0, 2, 4, 6, 8, 10, 12]
	type_dict={
		"major":    [0,  0, 0,  0, 0, 0, 0],
		"minor":    [0, -1, 0, -1, 0, 0, 0],
		"dominant": [0,  0, 0, -1, 0, 0, 0],
	}
	pitch_num=int((pitch_range+1)/2)
	pick_list=[x+y for (x,y) in zip(base_list,type_dict[type])][:pitch_num]
	print(pitch_num)
	chord_list=pitch_list[pick_list]+base
	print(chord_list)
	return chord_list



# Generate 7 modes:
def generate_mode():
	white_pitch=np.asarray([0,2,4,5,7,9,11])
	base_mode=np.append(white_pitch, white_pitch+12)
	mode_name=["ionian","dorian","phrygian","lydian","mixolydian","aeolian","locrian"]
	mode={}
	for i in range(7):
		mode[mode_name[i]]=np.append(base_mode[i:],base_mode[:i]+24)-base_mode[i]
	return mode

pitch_list=np.asarray(generate_mode()['mixolydian']+60)
pick_list=[0,2,4,5]

chord_1=pitch_list[pick_list]
chord_1_duration=[1,1,1,1]

for s in range(10):
	tstart=s*4
	chord_1_t=tstart
	for t in range(4):
		p=chord_1[t]
		d=chord_1_duration[t]
		midi.addNote(0,0,p,chord_1_t,d,100)
		chord_1_t=chord_1_t+d
		
	rt=tstart
	for t in range(4):
		pitch = choice(pitch_list)
		#track, channel, pitch, time, duration, volume
		midi.addNote(0, 1, pitch, rt+t * duration, duration, 100)
	
# Write output file:
with open('output.mid', 'w') as f:
	midi.writeFile(f)

# Play the result:
player = sound.MIDIPlayer('output.mid')
player.play()