Did Steve Martin rock his signature arrow-through-the-head prop at these bluegrass-y sessions? Hard to tell; except for unfussy harmonies, he expresses himself only via his stately, joyous banjo-plunking. The star is Edie Brickell, the hippie-pop one-hit wonder (and Mrs. Paul Simon), whose sassy vocals feel down-home but all her own. The songs tap folk tradition without getting stuck in it; they’re full of struggling lovers, an ’84 Ford, a baby in a suitcase and some memorable melodies. With help from guitar legend Waddy Wachtel and others, these two make a dandy duo. Hey, Mumford & Sons: Need an opening act?