Arnold Schoenberg was one of classical music’s most important rebels

Yet it was probably a good thing Gould did not bet, as Schoenberg has mostly vanished from the public consciousness. Other mould-breakers of the past century—Pablo Picasso, for instance, or the Expressionists—are still celebrated. Igor Stravinsky, who, like Schoenberg, provoked a concert-hall uproar in 1913, is beloved by classical-music audiences. So why is Schoenberg a ghost by comparison?