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iHeartRadio 2013: Katy Perry, Elton John roll out the hits

iHeartRadio 2013: Katy Perry, Elton John roll out the hits

LAS VEGAS -- To get a sense of how much music -- and how much corporate appeasement -- was crammed into the first night of this weekend's iHeartRadio Music Festival, consider this: Robin Thicke, whose "Blurred Lines" recently topped the Hot 100 for 12 weeks in a row, played one song.

Even Ryan Seacrest, the host of Friday evening's show, and Diddy, who turned up unannounced to introduce the R&B singer, agreed that Thicke had completely dominated the summer.

Yet after emerging through the audience and delivering an especially jumpy version of "Blurred Lines" -- the sly disco-funk jam that may (

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