Aria Blaze is a back up singer in the band "The Dazzlings" in Equestria Girls: Rainbow Rocks. She, along with Adagio Dazzle and Sonata Dusk, are mythical creatures called sirens that charmed ponies with their music: But they had to feed off of the negativity of others to gain this power.

They were quickly banished my Starswhirl the Bearded to another world where he believed they would not be able to use their magic: This world was where Canterlot High was. Here, taking the form as teenage girls, they fed using a red jewel around their necks.

Out of the 3, Aria is shown as negative and constantly whining about Sonata or the world they had been banished to.

Aria is a long, accompanied song for a solo voice in music terms.