Theremin 3D
A spatial musical instrument: move your mouse to play. Horizontal position controls pitch (logarithmically mapped from ~65 Hz to ~2000 Hz), vertical position controls volume. Click the canvas to toggle sound on and off. Sound waves radiate from a virtual antenna in 3D perspective, their color shifting with frequency.
f = fmin · (fmax/fmin)x
The instrument you play without touching
The theremin was invented in 1920 by Léon Theremin (born Lev Sergeyevich Termen) in Soviet Russia. It is the only widely known musical instrument played without physical contact. The player moves their hands near two antennas: one controls pitch, the other controls volume. The instrument produces an eerily pure, singing tone that has become synonymous with science fiction soundtracks and avant-garde music.
How a real theremin works
A theremin uses two radio-frequency oscillators. One runs at a fixed frequency; the other is connected to an antenna and its frequency changes as the player’s hand approaches (the hand acts as one plate of a capacitor, changing the LC circuit’s resonant frequency). The two oscillator outputs are mixed, producing a beat frequency in the audible range — the heterodyne principle. A second antenna and circuit controls the amplitude. Because the pitch is continuous (no frets, no keys), playing the theremin demands extraordinary precision and a trained ear.
Clara Rockmore
Clara Rockmore (1911–1998), a Lithuanian-born violinist who had to abandon the violin due to a bone condition in her arm, became the theremin’s greatest virtuoso. Her aerial fingering technique, developed with Léon Theremin himself, allowed her to play with a precision and expressiveness no one has matched since. Her 1977 album The Art of the Theremin remains the definitive recording.
Theremins in film and culture
The theremin’s ethereal sound made it a natural fit for science fiction films. Miklós Rózsa used it in Spellbound (1945) and The Lost Weekend (1945). Bernard Herrmann employed two theremins in The Day the Earth Stood Still (1951), creating the archetypal “alien” sound. The Beach Boys’ “Good Vibrations” (1966) features a similar instrument called the Electro-Theremin. Led Zeppelin’s Jimmy Page used one on stage. The theremin is a direct ancestor of the Moog synthesizer — Robert Moog began his career building theremin kits in the 1950s.
The simulation
This simulation uses the Web Audio API to generate real-time sound synthesis. Mouse X maps logarithmically to pitch (because human pitch perception is logarithmic), and mouse Y maps to volume. The canvas visualizes expanding concentric wave rings in 3D perspective, with the waveform visible as an oscilloscope trace. Wave color shifts with pitch: warm red/gold at low frequencies, cool blue/violet at high frequencies. Click the canvas to toggle sound on and off. Use the controls to change waveform shape, add vibrato, adjust reverb, and change the portamento (glide) speed.