The official lineup for Lollapalooza 2014 will feature performances by Eminem, Outkast, Nas, Childish Gambino, Chance The Rapper, Rich Homie Quan, Jhene Aiko, Iggy Azalea, Run The Jewels, Vic Mensa, and more. The 3 day festival will take place at Grant Park in Chicago on August 1-3.