Besides being used in robotics, stepper motors were sued to read and write floppy discs back in the day. They can also be programmed to make noise ‚ÄĒ musical noises.

Here, three stepper motors have been programmed to play the Super Mario Bros. theme song.

*applause*

The Super Mario Bros. theme song, played by 3 stepper motors [I Heart Chaos via Topless Robot]