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Stars Come Out for iHeartRadio Music Festival in Las Vegas

Miley Cyrus, Katy Perry, and Tim McGraw rock at the biggest music event in radio history.
2:49 | 09/23/13

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Transcript for Stars Come Out for iHeartRadio Music Festival in Las Vegas
This weekend, also, a huge one for music lovers. Some of the biggest names the business gathered in las vegas for the I heart vad yoe festival. Miley cyrus, katy perry, tim McGRAW, RYAN SEA CREST. One of the biggest music events. Rachel smith got backstage access. Reporter: The excitement swirling around the I heart radio music festival. The buzz surrounding miley cyrus' emotional performance of wrecking ball. ♪ her first appearance since splitting from fiance liam hemsworth. And the event known for bringing the radio to real life didn't slow down there there. It's exciting to play new songs. We're going bring some of that trap piness to the stage. We're going the trap you. Reporter: Why is this so special? It breaks down any wallace of genres. Reporter: Now in its third year, it's bringing the hottest names in music to a sold-out crowd. The first one we booked was katy perry. The artists like it. They get to see other artists they have never played with before and they never get to -- because they're always pigeon-holed into these events. Reporter: The biggest rock stars have groupies. I'm a big justin fan. I saw a drum that said queen on it. I said, wait a minute. Reporter: Day let me go backstage moment bfrs the big show. Every artist take this exact path to the stage. You want to go that way and check it out? Reporter: We have exclusive access. Behind me, robin thicke doing a mike check. It's a relaxed venn you where artists want to rock but have a little fun behind the scenes. We'll do it like this. If you ask the question and put the microphone around for the answer. Reporter: Yeah. Oh, yeah. The fun doesn't stop indoors at this mixed tape tour. This year, the music continues outdoors with acts like jason derulo and the band perry. ♪ Another one bites the dust ♪ Reporter: Back on the main stage legends like queen with guest singers like adam lambert remind audiences why they've been performing for decades. I wish freddie was around to see him. He would be awe struck. Lambert. Adam lambert was bringing it. Wow.

This transcript has been automatically generated and may not be 100% accurate.

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