In May, I got to cover the Shaky Knees Music Festival in Atlanta, Georgia, one of the biggest indie-inclined fests in the Southeast. The festival was celebrating its tenth anniversary, bringing in headliners like The Killers, Muse, The Yeah Yeah Yeahs, The Flaming Lips; Shaky Knees’ first-ever headliner, The Lumineers, also returned.  And, for the first time in the festival’s …