Think of early electronic music and you’ll likely see men pushing buttons, knobs, and boundaries. While electronic music is often perceived as a boys' club, the truth is that from the very beginning women have been integral in inventing the devices, techniques and tropes that would define the shape of sound for years to come.

After escaping Russia's communist revolution, Léon Theremin travels to New York, where he pioneers the field of electronic music with his synthesizer. But at the height of his popularity, Soviet agents kidnap and force him to develop spy technology.

Quite simply the finest theremin player who has ever lived, Clara Rockmore began her performing life as a violin prodigy at the age of 5 years old, still the youngest person ever admitted to the prestigious Imperial Conservatory of Saint Petersburg where she studied under the great Leopold Auer. Due to childhood malnutrition causing bone problems in her teen years, she was forced to give up the violin and moved to New York City in the mid 1920's where she met and became involved with Russian electronics genius Leon Theremin and helped him to refine and perfect his new instrument, giving advice from the standpoint of a musical performer to make the theremin more playable and developing her own hand techniques and exercises for playing the instrument.

Drawing on rare performances, interviews, animations, and experimental film, this documentary surveys the formative years of electronic music from 1948 to 1980. Featuring pioneering composers and inventors—including Milton Babbitt and Leon Theremin—the film explores the experimental technologies, academic laboratories, and creative struggles that shaped the early evolution of electronic sound.