1. Zac Brown Band's Southern Ground Fests: Avett Brothers, Grace Potter + More

    August 02, 2012 12:45 PM EDT Reflecting the diversity of music enjoyed by country music fans and the band's own popularity, Zac Brown Band has unveiled lineups for their two Southern Ground Music & Food Festivals, set for Nashville's Riverfront Park this Sept. 21-22, and returning to Charleston, S.C.'s…