Atlanta (CNN)The crowd is on their feet and chanting his name before he even takes the stage. “Tauren! Tauren! Tauren!”An electric guitarist unleashes a series of triumphant power chords as fans hold their smartphone cameras aloft, the glowing screens dotting the darkened concert hall like fireflies. Young women squeal as an athletic young man in form-fitting gray pants with pink stripes runs onto the stage and faces them with a huge smile.