Play it again, baby!
I really, really want one of these for my little domicile. The Schoenhut Tabletop Toy Piano is ridiculously cute. And, and, and! It's a way for a baby to make sounds happen that aren't horrible, out of tune melodies from a cheap little chip. The keys seem to hit little rods, for a sort of chime sound. It's not an inexpensive toy, but the best place to buy seems to be Live and Learn (the site is hard to navigate but the prices are right).
Did I mention this is ridiculously cute?