The theremin (originally pronounced [ˈteremin] but often anglicized as [ˈθɛɹəmɪn][1]), theramin,[2] or thereminvox, also known as an aetherphone is one of the earliest fully electronic musical instruments. It was invented by Russian inventor Léon Theremin in 1919,[citation needed] and it is unique in that it was the first musical instrument designed to be played without being touched. The controlling section generally consists of two metal antennas to sense the relative position of the player's hands. These sensors control audio oscillator(s) for frequency from one hand, and volume from the other. The electric signals from the theremin are amplified and sent to a loudspeaker.
Edit: here's another one some of you guys might enjoy more, To Zanarkan
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