The line-up will include: Lady Gaga, Coldplay, Alicia Keys, Steven Tyler, The Black Eyed Peas, Kenny Chesney, Jennifer Lopez, Carrie Underwood, Jane's Addiction, Nicki Minaj, John Mayer, David Guetta, Rascal Flatts, Bruno Mars, Kelly Clarkson, Sublime with Rome and special performances from Usher and Sting, with more to be announced.

This diverse array of acts will appear on one stage at the MGM Grand in Las Vegas on two consecutive nights, September 23 and 24, to celebrate the official launch of the New iHeartRadio, Clear Channel's free digital radio product that will combine its more than 750 broadcast radio and digital-only stations from 150 cities with the ability to create custom stations, delivering listeners everything they want all in one fully integrated service.

"Music is the heart of our business and we think there is no better way to celebrate the launch of the New iHeartRadio than with a groundbreaking, multi-day festival featuring the world's biggest, most exciting artists – and reaching the largest combined U.S. radio and online audience ever. This underscores Clear Channel's transformation to a dynamic integrated media and entertainment company with an unmatched reach in the U.S.," said Bob Pittman, Chairman of Media and Entertainment Platforms for Clear Channel Radio. "The New iHeartRadio will offer users a much broader, more integrated and customized digital listening experience than any other service available – and it's all in one product."

"Building up to the festival, we will be presenting the biggest national promotion in radio history," said John Hogan, President and CEO of Clear Channel Radio. "All 850 Clear Channel radio stations, spanning diverse music formats, introduced millions of listeners across the country to this historic music event. The majority of our stations will also feature exclusive radio and digital content including exclusive artist interviews and ticket giveaways. The announcement of the event alone has set new records. It's the first announcement ever to roadblock all Clear Channel Radio platforms and the teasers and the announcement have reached an estimated 100 million people."