My Little Pony: Equestria Girls - Rainbow Rocks (2014)

Music rules and rainbows rock as Twilight Sparkle and pals complete for the top spot in the Canterlot High "Mane Event" talent show. The girls must rock their way to the top, and outshine rival Adagio Dazzle and her band The Dazzlings, to restore harmony back to Canterlot High. IMDb