iHeart Radio, one of Internet radio's biggest contenders, brought the "biggest live music event in radio history" to MGM Arena last year for an amazing two-days of live music. This year, iHeart Radio is bringing their megafest back to the MGM Arena for another round of amazing performances on September 21st & 22nd.

With huge names like Deadmau5, Swedish House Mafia, Calvin Harris and Lil Wayne on the bill, along with a host of other huge pop and rock acts, this is shaping up to be another epic year for the iHeart Radio Music Fest. Check out the full lineup below and click here for more festival dates, lineups and info.