Rather than narrow it down to overtones or undertones, D.C.’s Branca-struck guitar battalion just calls itself Tone. The ensemble (which includes a drummer and bassist along with what would seem to be too many guitarists to fit on the Atlantis stage) is not entirely bereft of Groove, but the name is entirely apt. With the Dirt Eaters at 9:30 p.m. at the 9:30 Club’s Atlantis, 930 F St. NW. $5. (202) 393-0930. (MJ)