J.P. Harris brought out the Watson Twins late in his Saturday-night set at Mercy Lounge, a nice touch for an old-school country performance that thrived on its layers of harmonies and guitars. (There were as many as four guitars playing at once, and that's not counting the pedal steel.) But the real charm of the set came from Harris himself, who was full of self-deprecating humor between songs and a bundle of energy during them. Harris' mother was even on hand for the show, and naturally he dedicated one of the songs to her. J.G.