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"): Association for Contemporary Music (ACM) (Russian: ACM - Ассоциация Современной Музыки , "ASM - Assotsiatsiya Sovremennoy Muzyki") was an alternative organization of Russian composers interested in avant-garde music.
Relevant evidence: No