Leopold Stokowski was a champion of contemporary music. He conducted music without judgement, believing judgement to be the public’s job. During the Philadelphia Symphony Orchestra’s 1915-16 season,he programmed orchestral suites from Stravinsky’s Firebird and Petrushka, Richard Strauss’ Alpine Symphony, Scriabin’s Poem of Ecstasy, and Schoenberg’s Kammersymphonie No. 1. “This last, very cerebral work, although not…