Given Milwaukee’s Germanic roots, its actually surprising that more or the region’s bands don’t use an accordion, but Oshkosh’s Copper Box, which plays an 8 p.m. show at Shank Hall tonight, is one of the few bar-friendly acts that does, squeezing out festive, Zydeco-tinged covers of classic-rock songs (their most popular number is a tribute to Pink Floyd). Welcome to Wisconsin.
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