(MATH-ROCK DYNAMITE) Seattle duo Girth’s slide rule weighs a ton. Their new album, Living in Truth, is how math rock should be done: mercurial, unpredictable dynamics and time signatures; caustic guitar tones that sting like lye; instrumental interplay tighter than a Swiss watchmaker’s sphincter; and, best of all, no nutjob-poseur screaming to soil the music. Girth—guitarist Dave Webb and drummer Peijman Kouretchian—are like calculus PhDs who can whip your whole crew in a fight. (Chop Suey, 1325 E Madison St, 324-8000. 9 pm, $10, 21+.)