Question: Us Conductors accounts the relationship between  Clara Rockmore and this inventor who is most famous for his invention of what?
Related documents: [0]  [DOC] Lev Sergeyevich Termen (Russian: Лев Сергеевич Термен ) (27 August [O.S. 15 August] 1896 – 3 November 1993), or Léon Theremin in the United States, was a Russian and Soviet inventor, most famous for his invention of the theremin, one of the first electronic musical instruments and the first to be mass-produced. He also devised the interlace technique for improving the quality of a video signal, still widely used in video and television technology. His listening device, "The Thing", hung for seven years in plain view in the United States Ambassador's Moscow office and enabled Soviet agents to eavesdrop on secret conversations. [END] 
[1]  [DOC] Us Conductors is a debut novel by Canadian writer Sean Michaels. Published in 2014 by Random House in Canada and Tin House in the United States, the novel is a fictionalized account of the relationship between Léon Theremin (also known as Lev Termen), the inventor of the theremin, and Clara Rockmore, the musician regarded as the instrument's first virtuoso player. [END] 
Answer: 
theremin
theremin