TomorrowWorld is returning to Chattahoochee Hills, Georgia for its third year in the U.S. this September (2015). The festival recently announced its phase 1 lineup featuring TiestoSteve AngelloHardwellMartin GarrixBig Gigantic, Get Real and more. Now, they have unveiled the second phase of the lineup, which includes Bassnectar, Porter Robinson, Kaskade, The Chainsmokers, Thomas Jack, Laidback Luke and more, adding more fuel to the anticipation of this year's event. Check out the flyer above containing all of the performing artists announced thus far. Purchase your tickets at the official TomorrowWorld website, and stay tuned to Elektro for all of your TomorrowWorld 2015 news and updates.