Growing up in Greenwich Village, Sean Wilentz discovered the music of Bob Dylan as a young teenager; almost half a century later, he revisits Dylan’s work with the skills of an eminent American historian as well as the passion of a fan. Drawn in part from Wilentz’s essays as “historian in residence” of Dylan’s official website, Bob Dylan in America is a unique blend of fact, interpretation, and affinity—a book that, much like its subject, shifts gears and changes shape as the occasion warrants.