With Faith Salie now we'll give it a listen: It just might be world's strangest, spookiest musical instrument. You can see it . . . you can hear it . . . but you can't touch a Theremin.

Fishell says it takes a special person. "It's like a Rubik's Cube of a musical instrument that's not unlike driving a stick-shift truck through landmines," he says. "It's just rife with possible ...