Theremin is, and those that do usually only recognize it as having helped create the spooky and kooky music from films such as The Day the Earth Stood Still, Mars Attacks! and Plan 9 from Outer Space. During Trenton Computer Festival 08 musician Kip Rosser put on an amazing virtuoso performance of the Theremin as a revolutionary and versatile instrument, both solo and when joined by a synthesizer organ. Highly recommended if yiou ever get a chance to hear one!
Full set -here-