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Alison Krauss is no Barry White, but her lilting, earnest voice powers one of the most seductive scenes in recent film: Three angelic women standing in a lake, sensuous and mesmerizing as they wash their clothes, pour water over their long hair and clinging dresses, then drift toward the three gape-mouthed protagonists of O Brother, Where Art Thou? while nearly chanting the spiritual “Didn’t Leave Nobody but the Baby.” Such old-time Southern music is enjoying a resurgence thanks to O Brother’s popularity, and tonight the Cinema Arts Theatre will present Down From the Mountain, a documentary about the movie’s use of the music that features a concert of the artists—including Krauss, Emmylou Harris, and Ralph Stanley—who appear on the film’s gut-wrenching soundtrack. A performance by the Kossoy Sisters will precede the benefit screening. Come shiver to the sirens’ song—and be reminded of just how sad the deceptively titled “You Are My Sunshine” actually is—when Down From the Mountain screens at 8 p.m. at Cinema Arts Theatre, in the Fair City Mall, 9650 Main St., Fairfax. $15 (proceeds benefit the Folklore Society of Greater Washington and the Institute of Musical Traditions). (703) 978-6991. (Tricia Olszewski)