DIG IN DEEP (45 RPM LP)Listening through Dig in Deep, Bonnie Raitt's 20th album, the entire arc of her career becomes clear. In the early '70s she insisted on recording live in the studio with her road band. Later, various producers from Jerry Ragovoy to Peter Asher, from Don Was to T Bone Burnett assisted in shaping her sound, often with great commercial success: she's sold nearly 20 million records. She's learned from them all. There have been downs, but each was balanced