On Monday, Russell Sherman is performing all of Schoenberg's piano music in a recital at the Mannes School Concert Hall in Manhattan, the opening concert in the annual Festival for Contemporary Performance . Sherman's personal link to Schoenberg is his teacher Edward Steuermann. More than just a student of Schoenberg, Steuerman was the composer's go-to pianist in Berlin and Vienna. Here in the US, Steuermann premiered the Piano Concerto in 1944 with the NBC Orchestra and Leopold Stokowski. (Originally, Schnabel was the scheduled pianist, which may have offended Steuermann.) Despite this close connection to Schoenberg, Steuermann taught very little Schoenberg to his students, according to Sherman. Here he is in an interview with Gunther Schuller: "Well, he hardly taught me any modern music, and even Schoenberg he wasn't much interested in teaching. But he used to say--in that Polish way--'That's your music. You do what you want with it; I don't ha...