Stepper motors are often used in robots, due to the fact that you can precisely control their speed and position. Stepper motors were also used in floppy drives to control the read/write heads back in the day. They have one odd quirk, though. The motors make interesting sounds when you run them. So, without further ado, here is a trio of stepper motors playing the Super Mario Bros. theme song.

As a special bonus, here is an Amiga floppy drive making music by pulsing the drive motor and spinning a floppy up to speed. The volume is a little low on this one: