iHeartMedia announced the line-up for the fifth annual iHeartRadio Music Festival, which will take place on September 18 and 19 at the MGM Grand Garden Arena in Las Vegas. The event will broadcast live on iHeartMedia radio stations in 150 markets and will stream live on Yahoo Screen. A recorded and edited version of the 2015 iHeartRadio Music Festival will also return to the CW Network as a two-night special on September 29 and 30. More...