From Jesse McCartney to Demi Lovato, here's who the Jonas Brothers have surprised fans with on their Jonas20 Tour, so far.

Kevin Jonas of the Jonas Brothers and Jonas hype man “Big Rob” Feggans joined the Gab Cinque Band on stage to perform the Jonas hit “Burnin’ Up” at the packed club. The crowd, with arms outstretched, ...

This series 'allows Kelly to do what she does best — dive deep into the music and combine her musical expertise with her genuine curiosity,' says executive producer Alex Duda.