Over the course of a career now in its fourth decade, Bruce Springsteen has earned one of the most passionate, devoted followings in all rock 'n' roll. He's selling more records and concert tickets in his fifties than he sold in his twenties. Yet to many fans he remains an enigma. How has Springsteen produced such a consistent body of work and retained his currency while other top rock 'n' rollers have gone by the wayside? Jimmy Guterman, an accessible...