2012 iHeartRadio Music Festival
Green Day, Usher, Lil Wayne, Psy, Rihanna and more take the stage in Las Vegas
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Kevin Mazur/WireImage
Green Day
Billie Joe Armstrong of Green Day performs onstage during the 2012 iHeartRadio Music Festival at the MGM Grand Garden Arena on September 21st, 2012 in Las Vegas.
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