He became close friends with Shostakovich—Shostakovich "admired him as a first-class musician and a man of great wisdom and learning" and also said of him: "He trained not simply pianists, but in the first place thinking musicians. He didn't create a school in the specific sense of some single narrow professional direction. He shaped and nurtured a broad aesthetic trend in the sphere of pianistic art." Shostakovich's 1943 Piano Sonata No. 2 was dedicated to his former teacher.