Adagio Dazzle is a siren pony and one of the main antagonists of Rainbow Rocks. She is first seen complaining with her cohorts about being trapped in the human world, but once she sees Equestrian Magic, she decides to take it for her own. She and the other sirens head to Canterlot High and start a battle of the bands. The arguing and ensuing conflicts make a substance called negative energy on which they feed. Once gaining enough power she and her cohorts use it to break up the Mane 6 and then become more powerful to take over the school. In the final battle, the Mane 6 fight back and, with Sunset Shimmer's help, they win. The sirens are rendered tone deaf and booed off of the stage. She is portrayed as the most manipulative, cunning, sadistic, smart and evil of the group.