By Sinead Garvan
Newsbeat entertainment reporter
Miley Cyrus, Fall Out Boy and George Sampson have all performed at the first ever BBC Switch Live event.
Hundreds of fans packed out the Hammersmith Apollo in London on Sunday afternoon.
The show was exclusively for 14 to 17-year-olds and hosted by Radio 1 DJs Nick Grimshaw, Annie Mac and Kelly Osbourne.
UK pop-rockers McFly opened the show, which also featured RnB singer Ne-Yo and Swedish dance act Basshunter.
McFly's drummer, Harry Judd, told Newsbeat: "That was really really good, we've just been to Brazil and the crowds out there were amazing, so it's good to see they're just as good back home."
Danny from McFly plays up to fans at London's Hammersmith Apollo
"It's a real honour to be part of such a great line-up, that's why we were so determined to do this show and that's why we came back early (from Brazil)."
Harry's bandmate Danny Jones certainly put all he had into the performance.
Just as McFly came off stage he said: "I've never sweated so much in my life, my face is throbbing!"
15-year-old singing star Miley Cyrus flew into the UK just to play at BBC Switch Live.
She said it was incredible: "Honestly that was the best concert I've ever done, we came off and we were like 'That was awesome.'"
On the crowd, she said: "They rock, we were just like 'This is the best crowd I've ever been a part of,' it was insane watching everyone jumping up and down.
"I've never been so excited after a show. I'm ready to go do it again."
Miley also took a camera on stage with her to remember the event.
Miley Cyrus said the Switch crowd was the best she'd played to
She said: "They're so loud I thought I'm getting my camera and videotaping."
US RnB singer Ne-Yo also flew in from the States just for the show.
He got some of the loudest screams of the afternoon from the teenage girls when he went into the crowd.
He said: "That's the cool thing about venues like this - when you can actually reach out and touch your fans.
"The stage was even a little too far for me, I would have liked to stage dive if I could."
He was the only RnB act on the line-up, but Ne-Yo told us that was why he wanted to do the show.
He said: "The diversity of it - you've got me, you got a rock band - Fall Out Boy.
"You got Miley Cyrus - who's the biggest thing in the world, it's diverse, it's bringing all these different genres of music together to where ultimately it's just one genre of music - good music."
Not just a pair of dancing feet... George Sampson also sang
Britain's Got Talent winner George Sampson took the opportunity to show the crowd he could sing, as well as dance.
He performed his song Heads Up.
He admitted he was nervous beforehand: "That was scary, I've never sung like that before in front of an audience.
"Winning the show has opened the door to allow me to sing."
Basshunter, who reached number one in the charts with dance hit Now You're Gone, added to the show's eclectic line up.
He told Newsbeat it was a good thing: "This could be anything because everything is played on the radio, so basically it was a perfect line-up for the crowd, they clearly enjoyed themselves."
Fall Out Boy closed the show. The fans, who'd earlier been singing along to Miley Cyrus, seemed to know the words to the most of their songs as well.
The US rockers had taken time out of their European tour to play.