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Grooveshark has teamed up with White Castle to offer 1 lucky person tickets to Summerfest. Enter the sweepstakes by June 5th, and you and a friend might find yourselves enjoying round-trip airfare, lodging for 3 nights, and a full 3-day pass to the world’s largest music festival. Oh, and in case you need an extra nudge, take a peek at what acts will be taking the stage at the June 26th event.:


Line-Up
FUN.
Pitbull
John Mayer
Imagine Dragons
Diplo
Tim McGraw
MGMT
Neon Trees
New Kids on the Block
K’naan
Jason Aldean

Enter the sweepstakes by June 5th for a chance to win.