Theremin
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The theremin is an electronic musical instrument controlled without physical contact by the performer. It is named after its inventor, Leon Theremin, who patented the device in 1928.
A Moog Etherwave, assembled from a theremin kit: the loop antenna on the left controls the volume while the upright antenna controls the pitch.
Alexandra Stepanoff playing the theremin on NBC Radio, 1930
The components of a modern Moog theremin, in kit form
A robot playing the theremin
Electronic musical instrument
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An electronic musical instrument or electrophone is a musical instrument that produces sound using electronic circuitry. Such an instrument sounds by outputting an electrical, electronic or digital audio signal that ultimately is plugged into a power amplifier which drives a loudspeaker, creating the sound heard by the performer and listener.
Robert Moog, inventor of the Moog synthesizer
Diagram of the clavecin électrique
Telharmonium console by Thaddeus Cahill 1897
Theremin (1924)