Twenty years after he died of a stroke, pianist Glenn Gould is still a star. David Patrick Stearns wonders why. “Philosophically, I admire Gould’s irreverence: I believe that every performance should confront and challenge the listener. However, his insights often arose from obscure, perverse viewpoints. Once, he recorded Mozart piano sonatas to illustrate why the composer wasn’t, to his mind, much good. These interpretive agendas often weren’t presented with great regard for communication.”