"After being sent on a lengthy tour of Europe starting 1927 – including London, Paris and towns in Germany[14][19] – during which he demonstrated his invention to full audiences, Theremin found his way to the United States, arriving on 30 December 1927 with his first wife Katia.[20] He performed the theremin with the New York Philharmonic in 1928. He patented his invention in the United States in 1928[21][22] and subsequently granted commercial production rights to RCA.
Theremin set up a laboratory in New York in the 1930s, where he developed the theremin and experimented with other electronic musical instruments and other inventions. These included the Rhythmicon, commissioned by the American composer and theorist Henry Cowell.
In 1930, ten thereminists performed on stage at Carnegie Hall. Two years later, Theremin conducted the first-ever electronic orchestra, featuring the theremin and other electronic instruments including a "fingerboard" theremin which resembled a cello in use.
Theremin's mentors during this time were some of society's foremost scientists, composers, and musical theorists, including composer Joseph Schillinger and physicist (and amateur violinist) Albert Einstein.[clarification needed] At this time, Theremin worked closely with fellow Russian émigré and theremin virtuoso Clara Rockmore." http://en.wikipedia.org/wiki/L%C3%A9on_Theremin
Leon Theremin and Clara Rockmore (start at 1:32 to about 3:00)
Peter Pringle Tuvan Throat Singing
Revised John Ellinger, January - September 2013