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JPP is a group of back-country roots musicians with a collective craving for modernism and far-out tone structures. The double-bass-harmonium-and-four-violin sextet updates a centuries-old Scandinavian folk tradition in a way that would make Coltrane proud—indeed, its members liken their sound to a “wall of fiddles.” Granted, the pride of Järvelä, Finland can seem downright Midwestern compared with a lot of world-music exotica, but JPP’s cutting-edge folk is as transcendent as it is traditional—just think of the Kronos Quartet playing the Pogues’ catalog for an audience of music majors. Ambitious, sure, but drinking music nonetheless. At 9 p.m. at Iota, 2832 Wilson Blvd., Arlington. $10. (703) 522-8340. (Brett Anderson)