Imagine Dragons, Pretty Lights, Arctic Monkeys, Weezer and the Lumineers will also be making the trek to Dover, Delaware for the third year of Firefly. Two of 2013′s most talked-about rappers — Childish Gambino and his buddy Chance the Rapper — both land on this year's bill, while a number of female-fronted acts — Sky Ferreira, Tegan and Sara, Sleigh Bells, Phantogram and tUnE-yArDs — will take the stage as well. more on this story

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