I found this little clip of a guy juggling on a large keyboard to create a few songs. This guy is absolutly amazing. I’ve never seen anything quite like this. Definetly worth a look! http://www.big-boys.com/articles/pianoballs.html
He even plays part of the Canadian National Anthem
FullHouse is doing this without an electric toy.
Also have a look at pianojuggler.com (Dan Menedez).