Elvis Presley belongs on the short list of artists who changed the course of popular music in the 20th century. He may not have invented rock & roll, but he was indisputably the first rock star, a singer whose charisma was tightly intertwined with his natural talent, a combination that was combustible, sexy, and dangerous. Presley seized the imagination of America with four successive number one singles in 1956, and spent the next two decades near the top of the charts, weathering changes in fashion, self-inflicted missteps, and comebacks as his music expanded and evolved. Thr...