We weren't expecting a musical; the movie opens with a song! Overall, it was a cute, goofy movie that my boys enjoyed (once the shock of it being a musical wore off).
FYI ~ The "few instances of mild cursing" referenced in the Common Sense rating includes about 5 minutes of Poopdeck Pappy ranting "haul-ass, haul-ass" during a boat pursuit. If you have a kiddo who likes to repeat movie lines, I suggest previewing the boat chase scene.