Rainbow Dash begrudgingly takes Pinkie Pie and the Cutie Mark Crusaders to a concert after Applejack decides to bail on the event, a concert that Rainbow Dash is certain she'll hate. However, through the actions of three mischievous fillies, a good friend, and the power of a song, Rainbow Dash learns a valuable lesson about having fun and in not judging something, or somepony, by initial appearances.