A ring of sites featuring information, pictures, construction tips, and trivia about the theremin - an amazing electronic musical instrument! The theremin operates through capacitance. The player waves his hand in the vicinity of the instrument, which produces different pitches, depending on the distance from his hand to the instrument. It gives an eery sound that has been used in some movies, such as The Day the Earth Stood Still. The theremin was invented by a Russian professor, Lev Sergeivich Termen, aka Leon Theremin. It was probably the very first invented electronic instrument. The photo is of a Moog theremin. Moogs were the first electronic synthesizers.