He sports a slippery country baritone, and she possesses a curling backwoods alto: Both John Howie Jr. and Melissa Swingle sing in unmistakable tones, having supplied their idiosyncratic instruments to some of the region's favorite bands. No longer a Two Dollar Pistol, Howie patiently leads his Rosewood Bluff away from his honky-tonk calling card; Swingle is just finding her sound after the end of The Moaners, drifting back toward the agitated lurk of Trailer Bride. Rootsy Charlotte shufflers Leadville Social Club open. —Grayson Currin