"They'll blow your socks off if you have any on," reads a fan's Facebook post about the live capabilities of Rainbow Kitten Surprise. And it's true. This undefinable five-piece band from the small town of Boone, N.C. boasts a blend of charisma, musical chops, sing-along harmonies and breakneck creativity that's made it a nearly instant favorite among the nation's sandals-wearing music festival crowd.

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