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There are avant-garde songwriters, and then there’s Laurie Anderson, who’s been deftly walking the tightrope between eccentric pop artist and soothsayer since her first big hit, 1981’s “O Superman.” Over the course of its eight expansive minutes, “O Superman” evolves from a series of cryptic spoken-word chants into a nightmarish premonition for the dystopian future. “Here come the planes/They’re American planes/Made in America/Smoking or non-smoking,” she sings, her voice pitched down and filtered heavily through a synthesizer. Legend has it that Anderson, who’d stopped performing the song for a long time, brought it back for a post-9/11 benefit concert at New York City’s Town Hall. Suddenly, her once vague predictions seemed as alarming and unsettling as ever. At age 67, more than a decade removed from that show and three decades from “O Superman,” Anderson remains as wily as ever. You may have to wait 20 years for her Birchmere set to make sense within the context of current events, but when it does, it’ll be worth it. Laurie Anderson performs at 7:30 p.m. at 3701 Mount Vernon Ave., Alexandria. $39.50. (703) 549-7500. birchmere.com.