According to the Chicago Tribune, Mumford & Sons, Phoenix, Vampire Weekend, and the Killers will be among the headliners at this year’s Lollapalooza, held in Grant Park on August 2 to 4. Also set to perform at the festival are The Postal Service and The National, but you’ll have to wait until next month before Lollapalooza promoters C3 Presents announce the rest of the line-up. You can purchase early bird tickets next Tuesday at 10 AM Central over at Lolla’s website.