In his time, the Austrian American composer Arnold Schoenberg (1874-1951) was an international icon. His twelve-tone system was considered the future of music itself. Today, however, leading orchestras rarely play his works, and his name is met with apathy, if not antipathy. With this interpretative account, the acclaimed biographer of Toscanini finally restores Schoenberg to his rightful place in the canon, revealing him as one of the twentieth century's most influential composers and teachers. Sachs shows how Schoenberg, a thorny character who composed thorny works, raged against the "Procrustean bed" of tradition. Defying his critics--among them the Nazis, who described his music as "degenerate"--he constantly battled the anti-Semitism that eventually precipitated his flight from Europe to Los Angeles. Yet Schoenberg, synthesizing Wagnerian excess with Brahmsian restraint, created a shock wave that never quite subsided, and, as Sachs powerfully argues, his compositions must be confronted by anyone interested in the past, present, or future of Western music.