Back in 1950 the great [Leroy Anderson] composed The Typewriter Symphony. An orchestra piece that features a typewriter as the lead instrument. It's fantastic.
Well, [Chris Gregg] was a big fan of the composition, so he decided to do the next best thing to learning how to play it himself. He built and programmed an automatic typewriter to do it for him!
It's a 1960s Smith Corona electric typewriter which he has interfaced with a custom PCB that controls the mini 12V solenoids to hit the keys, which is then controlled by an Arduino. Slap that together with some basic music software and you've got yourself an automatic typewriter symphony!