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Theremin (RCA AR-1264; 1930) https://en.wikipedia.org/wiki/File:Theremin_At_The_Musical_Museum,_Brentford,_London_(clip).jpg Official website: http://www.nadiareisenberg-clararockmore.org

http://thereminsociety.com/Leon_Theremin_Playing_Theremin.jpg

https://en.wikipedia.org/wiki/File:Maestro_Theremin_TH-1.jpg

In 1906, American engineer, Lee De Forest ushered in the "electronics age".[6] He invented the first amplifying vacuum tube, called the Audion tube. This led to new entertainment technologies, including radio and sound films. These new technologies also influenced the music industry, and resulted in various early electronic musical instruments that used vacuum tubes, including: Theremin by Léon Theremin in 1920. Most early synthesizers used "heterodyne circuits" to produce audio frequencies, and were limited in their synthesis capabilities.

At this time, Theremin worked closely with fellow Soviet émigré and theremin virtuoso Clara Rockmore (Clara Reisenberg as she was when they first met). Theremin had several times proposed to her, but she chose to marry attorney Robert Rockmore, and thereafter used his name professionally.