When Robert Cray first came up in the early ‘80s, he was billed as the young savior of the blues, the guy who was going to take the aging American music form and inject newness into it. He did that to some extent, by not staying within the confines of the blues: Cray admits readily, in the documentary that accompanies the two live CDs in this commemorative package, that he was never a blues purist. Several times, he points out that his approach is all-inclusive: jazz, gospel, rock and other American roots forms all found their way into his mix. Some called it diluted—to be sure, Robert Cray was no Howlin’ Wolf or John Lee Hooker. His was, and remains, a more cosmopolitan brand of blues, its edges polished down to a shine. But whatever it is that he’s got going on, it’s clear that he’s long been a master of it. In both the present-day live recordings here, and the ‘80s vintage tracks that augment them, Cray is never less than likable, warm and accessible, if not what some might deem authentic. Both on his own compositions (“Bad Influence,” “I Shiver,” “Smoking Gun”) and the classics he adapts to his style (tunes by Willie  Dixon and Isaac Hayes), Cray and his equally ace musicians are never less than engaging.