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"The sound he brings out of the piano is unheard of, or at least I have never heard anything like it. He himself seems not to know how he produces these novel and quite incredible sounds – although he appears to be a man of intelligence and not just some flaccid dreamer. And such fullness of tone, achieved without ever becoming rough, I have never before encountered."
Arnold Schoenberg 1935 letter to Otto Klemperer
