Their Theremin Show

a theremin                    from analoguehaven.com

The theremin is a pretty cool musical instrument. In a city in Japan, 272 people set a world record ~ confirmed by Guinness World Records ~ for the most people playing theremins together: http://www.bbc.co.uk/news/world-asia-23393958
   Here's a video of the theremin's inventor, Leon Theremin, playing his instrument: http://www.youtube.com/watch?v=w5qf9O6c20o