Tonight begins the third annual iHeartRadio Music Festival, hosted by Ryan Seacrest, at MGM Garden Arena in Las Vegas. The festival features some of today's biggest stars, whose tunes flood your radio's airwaves on a daily basis. Clear Channel has been vigorously promoting the festival all year, so at this point you've probably either won tickets to the event or can't stand to hear about it anymore. But for those of you who have managed to avoid the radio, here are the details. 

The lineup tonight features Elton John, Katy Perry, Queen with Adam Lambert, Keith Urban, Tiesto, Benny Benassi, Chris Brown, J. Cole, Fun., Robin Thicke, and up-and-comers The Summer Set. It was also reported earlier today that Fun. Frontman, Nate Ruess will be joining Queen on stage. We are not sure what this means for Adam Lambert.

According to the Las Vegas Sun, Elton John will spend an hour on Facebook.com/EltonJohn answering questions on his latest album "Diving Board."

The two-day festival begins tonight at 7 p.m. PT (10 p.m. ET). You can stream the shows live on Yahoo! Music, the Live Events View app on PlayStation 3 or on iHeartRadio Music Festival '13 Radio

Let us know what you think of the performances in the comments section below!

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