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With their plaid attire and quaint Mexican folk instruments, David Wax Museum’s members slightly resemble survivors of the Battle of the Alamo. But while using a donkey jawbone (that’s quijada in Spanish) for percussion seems antiquated and slightly morose, DWM’s music sounds pleasantly contemporary, fitting between the Avett Brothers and Old Crow Medicine Show in the current alt-folk scene without veering into obnoxious soft-rock refrains à la the Lumineers. On the group’s latest album, Knock Knock Get Up, lead vocalist David Wax opines about the ebbs and flows of life while multi-instrumentalist Suz Slezak accompanies him with accordion strains, foot stomps, and hand claps. A rotating group of folk artists round out the sound. Even though they’re only a supporting act at 9:30 Club tonight, audiences should expect things to get a bit raucous—and participatory. David Wax Museum performs with Carolina Chocolate Drops and Birds of Chicago at 7 p.m. at 9:30 Club, 815 V St. NW. $25. (202) 265-0930. 930.com.