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Tagging music as “experimental” or “electronic” (or both) invites a host of sonic implications, and that open-ended ideology is celebrated by the Sonic Circuits Festival of Experimental Music, D.C.’s annual showcase of art, sound, improvisation, and technology, which is sponsored by the local chapter of the American Composers Forum. Now in its eighth installment, the festival will feature more than 60 acts from across the United States and Europe, from the fluorescent beats of Baltimore’s Matmos and Food for Animals to the processed bagpipe swirls of New Zealand’s David Watson. The Velvet Lounge hosts tonight’s opening, boasting innovative locals like Deep End Ensemble, Blue Sausage Infant, and Kohoutek. Nightly performances will follow throughout the week at Velvet Lounge, Pyramid Atlantic, and the National Museum of Women in the Arts, each offering unique interpretations of the modern avant-garde. A compete schedule is at dc-soniccircuits.org. THE FESTIVAL BEGINS AT 7 P.M. AT THE VELVET LOUNGE, 915 U ST. NW. $8. (202) 462-3213.