Ron Rosenbaum’s latest book, Bob Dylan: Things Have Changed, is not a biography. It is instead a “ kind of biography”—which is a distinction with a difference. It is, in keeping with Rosenbaum’s long record of fine-tuned literary analysis mixed with historical and, yes, biographical detail, a study of Dylan’s songwriting and a reckoning with his moral, philosophical, and religious imagery and fixations. “Dylan has remade American speech, American thought, American attitude,” Rosenbaum writes.