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On Facebook, Geng lists his genre as “brutality,” and while that descriptor might sound a bit tongue-in-cheek, it’s not inaccurate. Whether as a DJ, event curator, or boss of the fringe-dwelling Purple Tape Pedigree label, the born-and-bred New Yorker promotes electronic club music that seems drawn from dystopian nightmares: all rough edges, hypnotic grooves, and pneumatic energy. This is metal machine music meant for catharsis, not escapism. Geng is one of the most connected and respected selectors in the club music underground, in New York and beyond. When DJing, he’s as likely to chop-and-screw Black Sabbath as he is to mix street rap cuts with horror movie scores, and as he opens the Forward Festival at Silver Spring cafe-record shop-event space Bump ‘n Grind, listeners should expect the unexpected. Forward, now in its ninth year, always brings exciting and experimental electronic music to town, but never before has it hosted music this brutal—especially in a suburban coffee shop. Geng performs at 6 p.m. at Bump ‘n Grind, 1200 East-West Highway, Silver Spring. Free. (301) 588-8000. bumpngrind.com.