The oatmeal container with the pushpins contains the song “program”. The pushpins are simply moved around to create different songs. The EV3 software mainly turns the 2 large motors at the set speed. We modified the speed of the motors for each song slightly. This was a fun project using a few things we had around the house. A large oatmeal container, push-pins, some metal s-hooks from the garage, and a kids xylophone. And of course our LEGO Mindstorms EV3 set. The software for the LEGO Mindstorms Music Box is very simple. All the program needs to do is turn the 2 large motors at a slow speed once the button is pushed. In fact, most of the ‘programming’ for this robot will be placing the pushpins to program new songs.