Iheartradio Music Festival September 23, 2011

Described as 'The biggest live music event in radio history,' the IHeartRadio Music Festival offers two days of performances by some of the top acts around. The lineup includes Lady Gaga, Coldplay, Steven Tyler, Black Eyed Peas, Usher, Sting, Kenny Chesney, Alicia Keys, Jennifer Lopez, Jane's Addiction, Carrie Underwood, Kelly Clarkson, Bruno Mars and more.