When Six Organs of Admittance leader Ben Chasny decides to freak out musically, as he and his cohorts do on the new Ascent, he does so with fiery finesse. Whereas most 6OOA releases conjure a witchy, woodsy folkadelic vibe, Ascent mostly summons electrical storms and seismic shifts. Some of Chasny’s hell-raising buddies in Comets on Fire help tilt the songs into psychedelic pyrotechnics, but without forfeiting Six Organs’ serpentine melodic grandeur. Tonight should be very stimulating. (Crocodile, 2200 Second Ave, www.thecrocodile.com, 8 pm, $12 adv, all ages)