Question: The Association for Contemporary Music's leading members include what Russian composer of the early Soviet era, best known for his early futurist piano sonatas, orchestral episodes, and vocal music?
Sentence (from "Association for Contemporary Music"): Its leading members were Dmitri Shostakovich, Nikolai Myaskovsky, Vissarion Shebalin, Alexander Mosolov, Gavriil Popov, and Vladimir Shcherbachev.
Relevant evidence: Yes