Amazing what I found looking for the best way to connect my analog theremin to some MIDI in:
"The Theremin-X Project imagines a small concert in which a theremin is hooked up to vibrators worn by audience members, with the pitch, volume, and intensity of the music translated directly into vibration."
And they did it:
"The piece features Armen Ra on the theremin, with Casey Calvert, Lance Hart, and Ella Nova playing the audience members."
The video must be safe for work.