Clara Reisenberg Rockmore was a Litvak classical violin prodigy and a virtuoso performer of the theremin, an electronic musical instrument. She was the sister of pianist Nadia Reisenberg.
Rockmore and Léon Theremin in 1929.
The theremin is an electronic musical instrument controlled without physical contact by the performer. It is named after its inventor, Leon Theremin, who patented the device in 1928.
A Moog Etherwave, assembled from a theremin kit: the loop antenna on the left controls the volume while the upright antenna controls the pitch.
Alexandra Stepanoff playing the theremin on NBC Radio, 1930
The components of a modern Moog theremin, in kit form
A robot playing the theremin