For this project I created a jukebox with two buttons that play two different songs when pressed. I also added functions for the A and B button to either slow or speed up the songs and another function to stop the music when both A and B are pressed. I think adding this feature made it a little difficult because I didn't know I had to first set up a set tempo for code to follow. My project also has a little animation to go with the music.
https://makecode.microbit.org/_8DjWFdFmA7jY