Dave Marsh’s “Bruce Springsteen: Two Hearts” is the definitive biography of Bruce Springsteen, one of the most important singers and songwriters of the past thirty years. The two earlier biographies by Marsh, “Born To Run” and “Glory Days,” are combined in this book that follows Springsteen’s career from its beginning. It offers an analysis of Springsteen’s output, concentrating on his record “The Rising” and its influence on American society.