I'll be curious to see how this translates across the pond. I personally really enjoyed it, and its become quite a hit with the kids over here. It's a musical in the best tradition of Rogers and Hammerstein (but with a modern rock beat).
SLIGHT SPOILERS:
It's a musical about a basketball player who meets a girl on holiday. During the trip they are forced to participate in a karaoke party together, and discover they really enjoy singing.
When he returns home, he finds she's transferred to his school. (Reminiscent of Grease.) He's a "cool guy" on the basketball team and she's a big academic achiever who hangs out with the smart kids. Neither wants to admit to their friends they have a desire to try out for the school's musical production.