By the time he was 24, Pete Townshend, the guitar-spinning auteur of the ! seminal 1960s rock group the Who, had secured a permanent place in the annals of pop culture. His song My Generation, with its juvenescent proclamation, "Hope I die before I get old," had become the anthem of the Woodstock era. And his "rock opera" Tommy, about an abused child who liberates himself by becoming a pinball wizard, had been adopted as the definitive parable of its time by every would-be rock rebel with a cause.
Fast-forward more than two decades. Townshend, his hairline receding and his temples...