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21 Most Epic Moments from the 2011, 2012, 2013 and 2014 iHeartRadio Music Festivals

We can't wait to see what 2015 brings!

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    The 2011 iHeartRadio Music Festival was the first year of what has since become an epic annual event. The Black Eyed Peas opened the show, and it was pretty incredible to see a bona-fide headliner (They performed at the SuperBowl!) open the entire festival.

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    Photo: Brian Friedman for iHeartRadio

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    Also in 2011, Lady Gaga and Sting shared the stage for a special collaboration of "Stand By Me" and "King of Pain" - an unforgettable moment in iHeartRadio Music Festival history!

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    Photo: Brian Friedman for iHeartRadio

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    Jay-Z and Alicia Keys also shared the stage at the inaugural iHeartRadio Music Festival to perform "Empire State of Mind," and they brought down the house!

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    Photo: Brian Friedman for iHeartRadio

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    Bruno Mars paid tribute to Amy Winehouse, who died in July of 2011 - two months before the 2011iHeartRadio Music Festival - with a special performance of "Valerie."

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    Photo: Brian Friedman for iHeartRadio

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    Taylor Swift performed at the 2012 iHeartRadio Music Festival - one month before the release of her record-breaking album, RED. She performed the album's first single, "We Are Never Getting Back Together," setting the stage for the banner year she was about to have.

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    Photo: Brian Friedman for iHeartRadio

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    It's near impossible to mention the 2012 iHeartRadio Music Festival without acknowledging Green Day's meltdown moment. Billie Joe Armstrong told the festival crowd, " I'm not f***ing Justin Bieber, motherf***ers!" before smashing his guitar, throwing up a middle finger and walking off the stage. He checked into a rehab facility days later.

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    Photo: Andrew Swartz for iHeartRadio

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    Mary J. Blige surprised everyone during her 2012 iHeartRadio Music Festival set when she brought music icon Prince onstage for an unforgettable duet of "Nothing Compares 2 U."

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    Photo: Andrew Swartz for iHeartRadio

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    One of the most talked-about, blogged about, and laughed about moments in iHeartRadio Music Festival history happened backstage in 2012 when Flava Flav accidentally mistook Miley Cyrus for Gwen Stefani. Check out the video!

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    Photo: Getty Images for iHeartRadio

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    Speaking of Gwen Stefani... No Doubt kicked off the 2012 iHeartRadio Music Festival with an epic performance that included a cameo from P!nk during "Just A Girl"... and a smooch!

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    Photo: Getty Images for iHeartRadio

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    The next night, P!nk opened the show with a high-flying performance that was part mouth-dropping circus acrobatic act, part rock show, part lesson in vocal dexterity. She sang flawlessly while suspended upside down from the rafters - all this while her baby slept backstage. And that was Saturday's opening act that year.

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    Photo: Andrew Swartz for iHeartRadio

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    Pitbull's 2012 iHeartRadio Music Festival closing performance was awesome when it happened, but what's even more epic is that it will live on in song for eternity. In his song "Hope We Meet Again" featuring Chris Brown from his album Global Warming, Mr. 305 raps, "One thing's for certain, two things for sure/ iHeartRadio, I close show."

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    Photo: Andrew Swartz for iHeartRadio

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    Miley Cyrus performed at the first-ever iHeartRadio Music Festival Village in 2013, where she made headlines for crying during an emotional performance of "Wrecking Ball."

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    Photo: Getty Images for iHeartRadio

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    Not only did Miley Cyrus generate buzz for her tear-soaked iHeartRadio Music Festival Village performance, she also raised eyebrows when she showed up backstage at the MGM Grand wearing this! YOWZA!

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    Photo: Getty Images for iHeartRadio

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    At the 2013 iHeartRadio Music Festival, Queen, Adam Lambert and Fun. performed "Somebody To Love" and "Fat Bottomed Girls" together during Queen + Adam Lambert's night 1 closing set, and it was one of the most talked-about moments of the year. Brian May later said the iHeartRadio Music Festival performance was the catalyst that ignited the idea for the Queen + Adam Lambert tour.

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    Photo: Brian Friedman for iHeartRadio

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    J. Cole and TLC joined forces at the 2013 iHeartRadio Music Festival to perform their song together, "Crooked Smile."

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    Photo: Getty Images for iHeartRadio

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    Kesha brought a little Rock & Roll (and Jack Daniels!) to the iHeartRadio Music Festival stage in 2013 when she brought Joan Jett out for a duet of "Bad Reputation,"and it did not disappoint!

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    Photo: Getty Images for iHeartRadio

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    One of the biggest moments in the history of the iHeartRadio Music Festival has to be Paul McCartney's second-night opening set at the 2013 show. That's right, we got a Beatle, and technically, he opened for Justin Timberlake.

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    Photo: Getty Images for iHeartRadio

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    Macklemore surprised the audience when he showed up to sing "Same Love" with Ed Sheeran at the 2014 iHeartRadio Music Festival.

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    Photo: Andrew Swartz for iHeartRadio

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    At the 2014 iHeartRadio Music Festival, Weezer had a group drum session.

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    Photo: Getty Images

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    Pete Wentz crowd surfed in a raft during Steve Aoki's set at the 2014 iHeartRadio Music Festival.

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    Photo: Brian Friedman for iHeartRadio

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    Usher set his shoes on fire onstage at the 2014 iHeartRadio Music Festival.

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    Photo: Getty Images