This MOC came about in a very roundabout way. I started out by experimenting with crankshafts and ended up with this. I'm really please with how the piano section and all of the motion turned out. I think the hand could use some work. Organic sculpting is definitely not my strength, and it does look a little creepy.
The fingers can be moved by manually turning the crank on the side of the base, or by connecting a 9V motor on the other side. All of the keys on the piano 'work', and actually feel pretty realistic.
I also put together a short video showing a bit about how it works.
Enjoy!
J