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Jeremy Arias/The Gazette
Bryce Eiman of the Chapel Hill, N.C. experimental music duo Bicameral Mind conjures sound from an effects box during a performance Friday night at Pyramid Atlantic Arts Center in Silver Spring. The performance was part of the Ninth Annual Washington, D.C., Sonic Circuits Festival of Experimental Music, which was held Sept. 22 to Sept. 27 and visited Silver Spring for the first time.