our singer plays one when she's not belly dancing-
between that and the Chapman Stick there's usually a line of folks in front of the stage after a show wanting to know what those crazy instruments are.
The Theremin is a very temperamental beast. It seems to know it's special, being the only instrument you don't actually touch to play... requires clearance of at least a couple feet to avoid interference, I find. Pretty nifty gadget though. Kind of like a fretless keyboard sort of thing. Takes a lot of work to get the feel for playing melodically since there really are no pitch references to work with. Very tough to master