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He first attracted attention trying to lure a groupie to his room with “Motel Blues,” but for the last 15 years or so the ever-rueful Loudon Wainwright III‘s been singing about the aftereffects of sex—kids, parenthood, ex-wives—and frequently coming up with something more than one-liners in the process. Julie Sanderson opens at 8 p.m. at the Birchmere, 3901 Mount Vernon Ave., Alexandria. $18.50. (703) 549-5919. (MJ)