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The album is called Merry Christmas, but the buzzing, brooding, sometimes caterwauling music on the F.M. Einheit/Caspar Brötzmann collaboration might well reduce Santa to cowering whimpers. Not that the sounds produced by the duo—one a member of Einstürzende Neubauten, the other the leader of band called Massaker—is assaultive in the heavy-metal sense. While the timbres are brutally electric, the free-form structure produces passages that are almost meditative. With Holy Cow at 8:45 p.m. at the 9:30 Club, 930 F St. NW. (202) 393-0930. $10. (MJ)