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A double-necked guitar is the musical equivalent of a fully automatic weapon—it has little practical use and in the wrong hands it can do a lot of harm. But the members of Boris are hardly civilian noobs or right-wing militia rockers. They are the Japanese drone-psych-metal delta force, and they need all 10 strings of Takeshi’s Geddy Leenstyle ax—plus lead guitarist Wata’s extra six—to get the job done. On last year’s Pink, the trio deftly leapt from Melvins sludge to slow-burning shoegaze crescendos to metal riffs so juiced up that they could have done battle alongside Arnold Schwarzenegger in Commando. For this year’s follow up, Rainbow, two guitarists were apparently no longer enough. A collaboration with Ghost guitarist and modern psych-rock hero Michio Kurihara, the record piles on yet another six strings’ worth of musical artillery. The results, however, are surprisingly restrained. The title track’s gentle psych-rock recalls Can’s most melodic moments. Similarly, the clean and pastoral “My Rain” is closer to Mogwai than Motorhead. But Boris’ members have hardly gone sensitive—they’re just displaying their professional range and probably saving some money on ear plugs in the process. Boris performs with Damon & Naomi, Michio Kurihara, and Jason Simon at 9 p.m. Friday, Oct. 26, at the Black Cat, 1811 14th St. NW. $12. (202) 667-7960.