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The Chant-driven popularity of medieval ecclesiastical music is one of the stranger commercial phenomena in recent memory, but certainly less distressing than, say, the success of Alanis Morissette. Easily the most captivating of the new crop of medievalists is Anonymous 4, a four-woman a cappella ensemble who transpose medieval polyphonic music for female vocal quartet. (The conceit is a slyly political one: The music of the era, of course, was composed for male voices.) Tonight’s program, “An English Ladymass,” bears the same title as the group’s exceptional 1993 album, and is composed of music that was performed at Salisbury Cathedral’s votive mass during the 13th century; accompanying poems and songs in Middle English offer a rare opportunity to hear the melodic language of Chaucer spoken aloud. At 7:30 p.m. at George Washington University’s Lisner Auditorium, 730 21st St. NW. $21-27.50. (202) 994-6800. (Nicole Arthur)