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2013 Firefly Music Festival lineup unveiled

Tom Petty & the Heartbreakers, Red Hot Chili Peppers, Vampire Weekend and Foster the People will headline the 2013 Firefly Music Festival, set for June 21-23 at Dover International Speedway in Delaware.

The lineup for the second annual festival also includes Lumineers, Grizzly Bear, Yeah Yeah Yeahs, MGMT, Public Enemy, Kendrick Lamar, Azealia Banks, Action Bronson, Calvin Harris, Amanda Palmer, Matt and Kim, Ellie Goulding, the Walkmen, Alabama Shakes, the Avett Brothers, Purity Ring, Japandroids and Atlas Genius.

More than 80 acts will perform on four stages. Tickets go on sale Feb. 21 at 12 p.m. ET on

Festival organizers are linking up with the St. Jude Children's Research Hospital for charity opportunities.

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