Gordon Charlton demonstrates how to play the theremin like a psycho killer, with Moog Etherwave theremin, Marshall Echohead EH-1 delay pedal, lobster knife and carving knife.

The performance, Playing With Knives by Beat Frequency , was Charlton’s entry in the Moog Halloween Theremin Contest.

“The knives serve a musical purpose,” explains Charlton, “Touching the metal blade causes an abrupt change in pitch or volume.”