The key word here is "inscrutable." When folk-blues scholars three or four generations down the line queue up the music on Corey Harris and Henry Butler's new CD, vu-du-menz, that'll be the word many of them use to describe it. Like a Chinese ring puzzle, or an Escher painting, the music and these men who made it are deceptively ordinary at first glance. Yet peeling away the surface reveals layer after layer of enigma, a "Magnolia"-esque ballet of two lives dest...