Question: Us Conductors is a fictonalized novel of a relationship that included a classical violin prodigy who was the sister of a pianist named what?
Sentence (from "Us Conductors"): 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.
Relevant evidence: Yes