What Is A Theremin?

A Theremin is an instrument that is consists of 2 antennas one that controls frequency (which you control with one hand) and one that controls volume (which you control with the other). It is named after it's inventor Professor

Léon Theremin who made it in 1928. Here is a video of Lydia Kavina (Grandniece of Theremin) playing "Claire de Lune" on the Theremin.