Hangout Fest Adds STS9, Railroad Earth, Grace and The Avett Bros

The Avett Brothers, STS9, Grace Potter and the Nocturnals, Brandi Carlile, JJ Grey and Mofro, Karl Denson’s Tiny Universe, Big Gigantic, Soja, Railroad Earth, Greensky Bluegrass, Rival Sons, & Honey Island Swamp Band have been added to the Hangout Music Festival lineup.