If there's such a thing as narrow-focus versatility, this set's a prime example. Duke Robillard has cut jazz, swing, rock, and instrumental albums, and he was Tom Waits's 2006 tour guitarist. Now the virtuoso returns to his true love-the music that first brought him acclaim as founder of Roomful of Blues-with two CDs that explore all aspects of the style. Dirty Chicago grinds like "You're Killin' Me Baby" tumble into gentle swingers like Robillard's take on T-Bone Walker's "Treat Me So Lowdown" and the hushed Wes Montgomery-influenced "Stoned." He conjures a raw Mississippi-juke-joint sound to interpret "Everything Is Broken," a tune penned by another former employer, Bob Dylan. And electric and acoustic guitars, plus some lute-like sax, are used to magnify the hoodoo vibe of Waits's "Low Side of the Road."