May 23, 2008 04:55 PM

These days, the Jonas Brothers are more polished than a tween girl’s “I Heart Joe” pendant. But back before they were full-fledged rock stars, the boys – Nick, 15, Joe, 18, and Kevin, 20 – had to really work at winning over an audience. In this exclusive clip of the band’s first audition in front of Disney Channel execs in 2006, the brothers pull out the stops to impress with their singing (Kevin and Nick rock out on guitar, while Joe shows off some stage moves on a conference room table) and comedic timing. Take a look and you’ll see just how far they’ve come. And for more behind-the-scenes scoop on the band check out PEOPLE’s special All About the Jonas Brothers issue, on newsstands now.

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