From Wikipedia: "Clara Rockmore (March 9, 1911 – May 10, 1998) was a Lithuanian virtuoso performer of the theremin, an electronic musical instrument. Rockmore made orchestral appearances in New York and Philadelphia and amazed audiences in coast-to-coast tours with Paul Robeson (in the 1930s), but it wasn’t until 1977 that she released a commercial recording called The Art of the Theremin. The album was recorded at the behest of Bob Moog and the record featured Rockmore performing with her sister Nadia Reisenberg, with whom she was accompanied at several of her concerts."