Союз композиторов СССР
He helped set up the Union of Soviet Composers in Moscow and remained one of its leading figures during his lifetime. He was a prolific composer of piano music and chamber music; many of his piano works were performed by Vladimir Horowitz. He is best known in Western Europe for his Second Symphony, the "Comedians' Galop" from "The Comedians" Suite, Op. 26 and his Third Piano Concerto.