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Lev Sergeyevich Theremin was a pioneering Russian inventor whose eponymous instrument, the thereminvox, revolutionized electronic music; between 1928 and 1938 he enjoyed triumphs in America - sold-out concerts, mass production of his instrument, and high society acclaim - before the Wall Street crash, personal upheavals, and waning fame led to his enigmatic 1938 return to the USSR. Against all expectations, after surviving Stalin’s notorious Magadan labor camp, he resumed work for Soviet secret services and lived on until 1993, passing away at the age of 97.