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Dr. John’s hep-cat drawl is indeed a glorious thing, capable of overlaying sorrow onto drinking songs, coaxing glee from heartbreak, and pretty much defining N’awlins cool with every word that passes through its filter. The voice only underscores the innate sense of style that is the real secret to his continuing relevance. Dr. John had the voodoo boogie piano down cold when he was still in his early 20s, but he might never have gotten the chance to define the idiom on a grand scale (he’s still pissed at Mick and Keith for failing to credit his piano work on some of those seminal Stones recordings) if he hadn’t been born with the air of a sage. Flamboyance continues to elevate his work, from the psychedelic wondertrips he took with Spiritualized and Primal Scream on last year’s Anutha Zone to ’92’s Goin’ Back to New Orleans, a tour through the technicolor depths of the Crescent City’s indigenous music. Granted, his live sets don’t often showcase his range, but his bayou-deity presence makes for great theater even when he’s playing to those aging frat boys looking to relive Mardi Gras. At 7:30 p.m. Wednesday, Feb. 17, at the Birchmere, 3701 Mount Vernon Ave., Alexandria. $25. (703) 549-7500. (Brett Anderson)