It's being billed as "the biggest live music event in radio history" (whatever that means), and so, the organizers of the brand-new iHeartRadio Festival have pulled out all the stops, delivering a lineup that's appropriately loaded with some of the biggest stars in the business.

Lady Gaga, Coldplay, Nicki Minaj, the Black Eyed Peas, Alicia Keys, Carrie Underwood and Steven Tyler are just some of the acts set to appear at the inaugural I Heart Radio fest, scheduled for September 23 and 24 at the MGM Grand in Las Vegas. They'll be joined on the bill by the likes of Kenny Chesney, Jennifer Lopez, David Guetta, Rascal Flatts, Kelly Clarkson and John Mayer (to name just a few).

Organizers promise that even more artists will be added to the bill as the summer stretches on. The eternally busy Ryan Seacrest will host the event, which will stream live online and via mobile devices at iHeartRadio.com, and across the websites of all Clear Channel-owned radio stations.

If you'd prefer to be there in person, you can get a first crack at tickets by liking iHeartRadio on Facebook. The pre-sale ends at 1 a.m. ET this Saturday, with tickets going on sale to the general public later that same day (at 1 p.m. ET) through Ticketmaster.com.

Of course, given that this is a radio fest, Clear Channel is also giving listeners plenty of chances to win a free trip to Vegas for the event. For more information on how you can score yours, check out iHeartRadio Music Festival's official site.