The iHeartRadio Music Festival at the MGM Grand Garden Arena in Las Vegas marked the official launch of iHeartRadio in Nevada on Sept. 23, 2011.

iHeartRadio is Clear Channel's free digital radio product combining more than 800 broadcast radio and digital-only stations from 150 cities. Check out the pictures of some of the celebrities who performed at the launch.

Jennifer Lopez
Jennifer Lopez performs during the second day of the iHeartRadio Music Festival at the MGM Grand Garden Arena in Las Vegas, Nevada September 24, 2011. REUTERS/Steve Marcus
Steven Tyler
Steven Tyler of Aerosmith performs during the second day of the iHeartRadio Music Festival at the MGM Grand Garden Arena in Las Vegas, Nevada September 24, 2011. REUTERS/Steve Marcus