Lady Gaga, John Mayer, Coldplay to Perform at Ryan Seacrest's Version of Woodstock

Inaugural music festival in Las Vegas will also include Jennifer Lopez, Steven Tyler and Carrie Underwood

Lady Gaga, Coldplay, Bruno Mars and Nicki Minaj are among a slew of performers who will swarm on Las Vegas in September for the inaugural iHeartRadio Music Festival, Ryan Seacrest announced on Monday.

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Seacrest will host the event, which is being produced by radio giant Clear Channel. The festival is being held to celebrate the relaunch of Clear Channel's Internet streaming service IHeartRadio, and will take place at the MGM Grand.

As might be expected from an event being hosted by Seacrest, there'll be a heavy "American Idol" factor to the proceedings, with current "Idol" judges Steven Tyler and Jennifer Lopez among the performers, along with former "Idol" competitors Carrie Underwood and Kelly Clarkson.

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Seacrest called the upcoming festival, which will be held on September 23 and 24, a "once in a generation gathering of artists and fans" and "a true, must-see music event.”

Other notable performers at the inaugural event include Alicia Keys, Rascal Flatts and the Black Eyed Peas, with more performers to be added to the roster throughout the summer. Tickets go on sale July 16.

See the current list of artists for the iHeartRadio Music Festival below.

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
Special performances from Usher and Sting