How the Theremin Makes Music Without Touching Anything

Leon Theremin's 1928 patent for an electronic musical instrument that generates sound based on the proximity of a performer's hands to metal antennas.

What it covers

The device uses two metal antennas to control sound parameters through the player's body capacitance. As a performer moves their hand near the vertical antenna, the circuit changes its frequency to alter the pitch. Simultaneously, moving a hand near the horizontal loop antenna changes the amplitude or volume of the sound. This allows for continuous, fluid control of musical notes without physical contact between the player and the instrument.

What it doesn't cover

• —Does not cover instruments that require physical keys or strings to be pressed.
• —Does not cover digital synthesizers that rely on microprocessors rather than analog vacuum tube oscillators.
• —Does not cover sound generation via optical sensors or infrared beams.

The clever bit

The invention cleverly uses the human body as a component in the circuit, treating the player's hand as one plate of a variable capacitor to influence the oscillation frequency.

Why it matters

This patent introduced the first widely recognized electronic instrument, laying the foundation for the entire field of electronic music. It proved that electricity could be used to create expressive, performative art, influencing everything from 20th-century avant-garde music to modern synthesizer design.

Real-world examples

• 1.The classic Moog Theremin
• 2.Soundtrack for the 1945 film Spellbound
• 3.The Beach Boys' Good Vibrations