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Thereminvox, also known as "The Thing", is an early electronic musical instrument invented by Russian physicist Léon Theremin in the 1920s. It consists of two metal antennas that detect the musician's hand movements, controlling the pitch and volume without physical contact. Thereminvox gained popularity in the 1930s and 1940s for its unique eerie and ethereal sound, often used in movie soundtracks and electronic music compositions.