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Gangstagrass — Dec. 18

New York City’s Gangstagrass, led by Brooklyn producer Rench, combines authentic bluegrass and rap into a new genre. Formed in 2006, the band saw its song “Long Hard Times to Come” selected to be the opening theme song of the FX television show Justified in early 2010. The song also brought Rench and rapper T.O.N.E.Z an Emmy nomination. Gangstagrass has been touring nationally, performing at everything from major festivals to highway rest stops.

8 p.m. on Dec. 18 at Frequency in Madison; $12;