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1from microbit import *
2import music
3tempo = 100
4
5while True:
6    music.set_tempo(bpm=tempo)
7    music.play(['C4:1', 'r:3']) # play C for 1 tick, rest for 3 ticks
8    if button_a.was_pressed():
9        tempo -= 5
10    if button_b.was_pressed():
11        tempo += 5  
12    

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