Big Trouble at the Battle of the Bands! Barbie and the members of her band, Charmz, receive a mysterious warning just before they enter their high school's Battle of the Bands competition - "Drop out of the contest or else!" Then, when someone mixes up their sheet music and ruins their stage set, Barbie knows she's got a mystery to solve. With the competition fast approaching, help Barbie investigate these baffling events. It won't be easy. To unravel the mystery she'll need to gain the trust and friendship of classmates and teachers, all the while struggling to keep her band together. Will the show go on? It's up to you and Barbie! Less