Behind the scenes of Disney Studios, Phineas and Ferb are working on there first musical. The evil Dr. Doofenshmirtz has stolen the notes from the songs in an effort to lead Phineas and Ferb to there doom, so he can take over the show. It's up to Phineas and Ferb to get the notes back and stop Doofenshmirtz. Travel through stages based on Phineas and Ferb episodes to reclaim the notes. Plus play musical mini-games from the musical itself.