He sang the anthems of a generation: "The Weight," "Up on Cripple Creek," and "Life Is a Carnival." Levon Helm's story--told here through sweeping research and interviews with close friends and fellow musicians--is the rollicking story of American popular music itself. In the Arkansas Delta, a young Levon witnessed "blues, country, and gospel hit in a head-on collision," as he put it. The result was rock 'n' roll. As a teenager, he joined the raucous...