After the Battle of the Bands, the Dazzlings become friends with the Rainbooms.

During one of their hangouts one of the Rainbooms asks where the sirens came from and the story is told by Sonata Dusk. A tale of a powerful beast that not only birthed the entire siren race and had the most powerful voice of all sirens. Adagio all the while listens and contributes to the story along with Aria from time to time.

WARNING: Personalities may change due to AU canon.

Cover art made by me .
Sequel story: Legend of the Sirens: A Fathers Return. one-shot Romance Crossover!