The sound of the Theremin is familiar from Hitchcock and science fiction soundtracks, and a version features on 'Good Vibrations' by The Beach Boys and 'Echoes' by Pink Floyd, and by Nine Inch Nails. It has also been seen played by Dr. Sheldon Cooper on Big Bang Theory. The new Leap Motion 'no touch' controller even has an application to play a digital Theremin on your PC.
Japan's musicians recently set a new world record for the most players on the Theremin - the musical instrument used without being touched. In the central city of Hamamatsu, 272 people performed at a concert.
This is totally different from the few year old Eigenharp, which seems to have more buttons and levers than any other instrument.
Theremin taught Lydia Kavina, his grand-niece how to play this interesting, simple, and eerie instrument. Here is a demo of the instrument LINK