A theremin is an electronic musical instrument controlled without physical contact. It consists of two metal antennas: one for pitch and one for volume. The pitch antenna controls the frequency of the sound produced, while the volume antenna controls its loudness. The musician moves their hands near these antennas, altering the electromagnetic fields, which changes the pitch and volume of the sound. The theremin is known for its eerie, ethereal sound and was popularized in early science fiction films. It is valued for its unique, expressive capabilities and its distinctive, otherworldly tones.

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