There’s a couple of videos here of a dancing robot built by some fellow at Carnegie Mellon. It’s actually a pretty impressive bit of engineering, although the demo with music is more impressive than the demo with the hand tapping the drum. (Click the “Keepon dancing to Spoon” label on the video player to see the music-based demo.) What makes me laugh, though, is that it looks like a dancing Peep to me.
It’s possibly also worth mentioning that the page says that the programming was done in Max/MSP, a product I worked on before founding Audio Damage. It’s amusing to know that my work may contribute to the advancement of dancing yellow blob bots.