Hailing from Duluth, Minn., Trampled By Turtles are a progressive bluegrass band that emphasizes the "progressive": since forming in 2003, they've incorporated country twang, indie atmospherics, and even classical dynamics into their sound. Splitting the difference between the Avett and Punch Brothers, the quintet's music offers an excellent mix of the spirited and the cerebral, and has resulted in them becoming fixtures on the festival circuit.