And the special performance by Adam Lambert and Queen follows last week’s news that Lambert has split with RCA Records due to a disagreement over the direction of his next album. Meanwhile, Katy Perry’s performance will mark the end of a quiet year for the pop singer, who has been working on the follow-up to 2010’s hits-packed “Teenage Dream” album. This year’s lineup features a performance by Timberlake after his Legends of the Summer stadium tour with Jay-Z concludes and right before Part 2 of “The 20/20 Experience” is released on Sept. The singer checked into rehab the next day, canceling all tour dates and promo appearances for Green Day’s ambitious “Uno! Dos! Tre!” album project last fall.

Perhaps the event’s most memorable, if ultimately somber moment, was an abbreviated set from Green Day, during which frontman Billie Joe Armstrong famously railed against the festival for (erroneously) cutting the band’s set short and proceeded to smash the band’s instruments across the stage. Blige’s set deadmau5 and My Chemical Romance’s Gerard Way Lil Wayne and Keyshia Cole and many more ( click here for a full 2012 iHeartRadio recap).

The 2012 iHeartRadio played host to several impromptu duets and collaborations, including a kickoff performance of No Doubt joined by P!nk for “Just A Girl” Usher joining Swedish House Mafia for the first live performance of their song “Euphoria” a surprise appearance from Prince for a pair of duets during Mary J. While a final schedule will be announced close to the festival, confirmed talent includes the aforementioned Timberlake, Perry, John, Mars, Queen and Lambert, as well as Muse, Tiesto, Chris Brown, Keith Urban, fun., Phoenix, Zedd, Maroon 5, Tim McGraw, Ke$ha, Thirty Seconds to Mars, Benny Benassi and other planned surprise guests. The main festival lineup was announced Monday morning (July 15) in a press conference hosted by Ryan Seacrest and Clear Channel programming chief Tom Poleman. Alesso to Play UEFA World Champions League Final Kick Off Show With Co-Headliners Anitta & Burna Boy

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