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For fans that can't be in Las Vegas for this weekend's 2012 iHeart Radio Music Festival, Yahoo! will stream it live in HD. Straight from the MGM Grand in Las Vegas, the iHeartRadio Music Festival will feature performances by Taylor Swift, Aerosmith, Rihanna, Usher, Bon Jovi, Lil Wayne, Green Day, Swedish House Mafia, No Doubt, Brad Paisley, Pitbull, deadmau5, Miranda Lambert, Enrique Iglesias, Linkin Park, Jason Aldean, P!nk, Mary J. Blige, Calvin Harris and Shakira, with more surprise special guests. WHEN: Friday, Sept. 21, at 8 p.m. MT and Saturday, Sept. 22, at 8 p.m. MT WHERE: Exclusively on Yahoo! Music at: http://www.iheart.yahoo.com/