Start backstage before the concert. Then you see Hannah sing 'Rock Star.' The Jonas Brothers come onstage to sing with the Hannah, and then by themselves. While they are performing, Hannah goes backstage and switches to Miley. Compared to Hannah's songs, Miley's are a little edgier, slightly sexier, as she sings the sisterhood anthem 'Girl's Night Out,' and the flamenco-inspired 'Let's Dance.' She sits down to sing and play guitar to 'I Miss You,'...