Randy George of The Ether and Aether Experiment recently produced an amazing cover version (plus music video) of the Gnarls Barkley song “Crazy”(Gnarls_Barkley_song) as played on a Theremin, specifically a Moog Etherwave Pro Theremin - Laughing Squid
A Theremin is:
the first musical instrument designed to be played without being touched. It consists of two radio frequency oscillators and two metal antennae. The electric signals from the theremin are amplified and sent to a loudspeaker - "Wikipedia": http://en.wikipedia.org/wiki/Theremin
Geeky cool music isn't it?!?
