John Hammond and David Lindley go back a ways, at least as far back as the green rooms of the '70s, when the dope was sweet and the picking sweeter. Hammond is one of the central figures in the '60s blues revival and a keeper of the resophonic guitar flame. In New York and Chicago, he learned firsthand from the best of the living bluesmen — John Lee Hooker and Roosevelt Sykes, for starters — and made the one-man boogie his own. In contrast, Lindley is a mystical and whimsical multi-instrumentalist. He's never met a guitar he couldn't turn into a science experiment, and he generally takes the stage surrounded by lutes and Weissenborns and Baglama-sazes. If you saw him with Jackson Browne at the Fox last year, you don't need further persuading that he's as riveting a solo acoustic musician as you'll ever hear.