In the events after the fall formal, all of Canterlot High is having trouble getting back to normal. Even worse when 3 ominous new girls audition for the Canterlot High School Musical Showcase which has now become a Battle of the Bands and an intense one at that. Now to try and defeat the Dazzlings; Miles Prower, Dan Green, Amy Rose, Shadow, and a few new friends must call upon their otherworldly hedgehog friend to aid the Rainbooms in a sure fire defeat of the new threat to not only the school, but the whole world.