A hardworking road warrior who became an unexpected superstar when she entered middle age, Bonnie Raitt developed a distinctly soulful hybrid of blues, rock, and R&B, a sound that carried her through her long, varied career. The breadth of her vision was evident on her early albums, where she balanced her original tunes with covers of blues chestnuts and such singer/songwriter peers as Jackson Browne, John Prine, and Randy Newman. She'd maintain this template throughout her career, but perhaps perfected it on Nick of Time, the 1989 album produced by Don Was. Winning three Gram...