The official lineup for the iHeartRadio 2012 Music Festival has finally been released with big names in pop, rap, rock, country, R&B and dance music topping the bill.

Hosted by American Idol’s Ryan Seacrest, Clear Channel Media’s second annual music festival is set for Sept 21 and 22 at MGM Grand in Las Vegas. The event is a celebration for the success of the new iHeartRadio, which spawned 10 million registered users in just eight months, faster than other sites like Facebook, Twitter and Instagram.

Artists set to perform include a good mix of genres that range from acoustic pop sensation Taylor Swift, Rihanna, Usher, ska-rockers No Doubt, Aerosmith, Green Day, Lil Wayne, Pitbull, country acts Jason Aldean and Miranda Lambert, Pink, Mary J. Blige, Linkin Park and more. The set time of the festival has yet to be announced.