Super Mario Brothers level 1 music using 3 stepper motors + 1 Arduino Uno
Code from first principals to drive 3 steppers in unison to play a 3-part tune. Stores the note data in code space to ensure it fits in the 2k memory of the Uno.
Video of it in action:
https://www.youtube.com/watch?v=x-HB-7vkRfY