Southern Culture on the Skids wouldn’t have ruled the surfabilly set for so long without frontman Rick Miller’s super twangy, super-reverb-erated, Dick-Dale-meets-Link-Wray guitar playing. But it’s his lyrical zeal for all things uncouth that makes the Chapel Hill trio such a compelling live act. When he’s on, Miller’s coarse musings on food, women, or both are every bit as fascinating and distinctively Dixiefied as the politically incorrect South of the Border billboards that used to visually pollute such long stretches of I-95. Tonight, the Skidders headline “Zackfest III,” a benefit concert that also features Genghis Angus, a Leesburg-area combo that favors decaf Feelies riffs and rustic librettos, along with fellow Virginians Dysfunctional Comfort, and Islamic Chauffers of Athens, Ga. The six-and-a-half-hour soiree includes a “rock ‘n’ roll flea market,” food, and dancing, all from 5-11:30 p.m. at the Old Waterford School, Rte. 9 & County Rd., No. 662, Waterford, Va. $15 (benefits the Zachary Lea Memorial Fund). (703) 882-3483. (Dave McKenna)