Younnat used this dot matrix printer to provide the rhythm track to his marimba and synthesizer etude. Soothing.
Sue Harding made music with dot matrix that is a bit more glitchy and alien.
Canadian art duo [The User] made an entire album titled "Symphony #2 for Dot Matrix Printers" by programming large series of text files to play 14 different printers. Dig those track names. (You can grab this on eMusic.)