Jazz Fest has long been known for much diversity, and this year's lineup is no exception, with Christina Aguilera making a bit of a live comeback as one of the headliners. Phish, Arcade Fire and Robin Thicke are also among the top-billed acts for the multi-day event, which is scheduled for the weekends of April 25-27 and May 1-4 at New Orleans' Fair Grounds Race Course.