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A good deal more varied than its early AmphRep jackhammering, Helmet‘s Betty dabbles with jazz, blues, and dub, achieving something akin to depth. But noise addicts can rest assured: Live, the new material will probably sound like building demolition anyway. Casper Brötzmann Massaker opens tonight and Wednesday at 8:45 p.m. at the 9:30 Club, 930 F St. NW. $15. (202) 393-0930. (Steve Kuhn)