The Rhythmicon—also known as the Polyrhythmophone—was the world`s first electronic drum machine (or `rhythm machine,` the original term for devices of the type). ==Development== In 1930, the avant-garde American composer and musical theorist Henry Cowell collaborated with Russian inventor Léon Theremin in designing and building the remarka......
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http://en.wikipedia.org/wiki/Rhythmicon
(from the article `Cowell, Henry`) ...Quartet (1935) was an experiment with musical form; the performers are given blocks of music to arrange in any desired order. With the Russian ...
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http://www.britannica.com/eb/a-z/r/45
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