Performances for the iHeartRadio Music Festival, begins tomorrow night in Las Vegas (Friday, September 19th and goes until Saturday, September 20th.) It will start at 10 pm ET and 7PM PT. If you prefer to listen to the show on the radio you can head over to the festivals website and type in your zip code for the the correct radio station. You can also watch on Yahoo! Live at the time listed above or you can watch on the CW Network where the festival will be shown as a two night special from September 29th to the 30th. You can see all of the artists that are performing here.