This could so easily have been called 'McFly - the Promotion'. British band McFly try to break the American market by playing the role of... A British Band called McFly trying to break the American Market.
The movie includes single played by band trying to get a start, band recording a new single, band playing Planet Hollywood, with a little scene when the drummer gets lost behind the scenes.
If you like McFly then this isn't that bad a movie. But unlucky for everyone else!