The 2013 lineup for the 2nd Annual Firefly Music Festival (taking place June 21-23 in the Woodlands of Dover International Speedway in Dover, DE) was just announced today. The top-billed artists are: Red Hot Chili Peppers, Tom Petty & the Heartbreakers, Vampire Weekend, and Foster the People. Tickets go on sale this Thursday, 2/21. If you’re planning on attending, you better get on there quick if you want to snag one of those glamping spots!