music.py

from microbit import *
import music

notes = ['A1', 'B1', 'C1', 'D1', 'E1', 'F1', 'G1', 'A2', 'B2', 'C2', 'D2', 'E2', 'F2', 'G2', 'A3', 'B3', 'C3', 'D3', 'E3', 'F3', 'G3', 'A4', 'B4', 'C4', 'D4', 'E4', 'F4', 'G4', 'A5', 'B5', 'C5', 'D5', 'E5', 'F5', 'G5', 'A6', 'B6', 'C6', 'D6', 'E6', 'F6', 'G6', 'A7', 'B7', 'C7', 'D7', 'E7', 'F7', 'G7']

"""
for note in notes:
    music.play('{}:4'.format(note))
    print('playing {}:4'.format(note))
"""
    
def get_next_note(note):
    return notes[notes.index(note)+1 % len(notes)]

assert get_next_note('A1')=='B1'
assert get_next_note('G1')=='A2'

TEMPO = 120
LOOP_LENGTH = 16
START_NOTE = 'E2'
LENGTHS = ['4', '3']

loop = [[] for _ in range(LOOP_LENGTH)]
current_note = START_NOTE
duration_flag = False
countdown = 0

j = 30
while True:
    for i in range(LOOP_LENGTH):
        if countdown == 0:
            if len(loop[i]) >= 1:
                duration_flag = not duration_flag
            loop[i].append(current_note + ':' + LENGTHS[duration_flag])
            countdown = int(LENGTHS[duration_flag])
            j-=1
            current_note = get_next_note(current_note)

        countdown -= 1

        for note in loop[i]:
            music.play(note, wait=False)
            print('playing {}'.format(note))

        sleep(60000/TEMPO)

        if j == 0:
            break
    if j == 0:
        break

for i, e in enumerate(loop):
    print(i, e)