Jonas Brothers, Demi Lovato Kick Off 'GMA' Summer Concert Series

Few things that can get hundreds of people to get up just after sunrise, file into Central Park in New York City and scream their hearts out, except the Jonas Brothers performing with Demi Lovato.

Nick, Joe and Kevin Jonas perform one of their fans' favorite songs.That was the scene this morning as "Good Morning America" kicked off its Summer Concert Series with two of the hottest acts in the business.Just after they finished taping their next hit movie, "Camp Rock 2," the Jonas Brothers and Demi Lovato kicked off their own summer tours with the "GMA" performance.