Theremin is an Electronic Musical Instrument. It is invented by Leon Theremin, a Russian and Soviet inventor. Theremin is played without physical contact by the artist. The instrument Theremin has been used in many movie sound tracks and also used in concert music. It works on proximity sensors
Theremin has a controller which consists of two metal Antennas which sense the relative position of the player’s hands. It controls Frequency of the Oscillators with one hand and the Amplitude (Volume) with the other hand. The Electric Signals generated by the instrument is fed to the Amplifier and then to the Loudspeaker.
Here is a video by Rob Scallon along with Karolina Ike who has mastered this instrument. She explains in detail about the instrument. Let us watch the video.