Years ago, I was contemplating conducting a piece that had an optional theremin part. I wistfully mentioned that fact to my ensemble and the hand of one the players shot up and she said, "I play theremin!" As she was (is) an incredibly gifted oboist — and everyone knows that when oboists aren't practicing, they're devoting their remaining moments to making reeds — I thought she was putting me on.
Well, as it turned out, she was an excellent "thereminist" as well! Today, she continues to lead a musical double life. Here's a fun little photo shoot she did last summer — with her "other" ax.
http://blog.bespokephoto.com/2010/08/musician-portrait-lara-wickes-theremin.html