The Dazzlings are a fictional vocal trio from the My Little Pony: Equestria Girls web series. The group composes of Adagio Dazzle as the main vocalist, and Sonata Dusk and Aria Blaze as backup vocalists. They all serve as the main antagonist band in Rainbow Rocks.
Originally sirens from Equestria, Star Swirl the Bearded banished the trio to the human world for using their singing powers (held in their gem pendants) to disrupt the ponies in the land. This eventually led to them enrolling at Canterlot High School for the Canterlot High School Musical Showcase (also called the Mane Event). There they planned to use their powers again, this time to take over the human world. Ultimately, the Rainbooms defeat them, rendering them unable to sing or harness Equestrian magic.
The Dazzlings return in the episode “Sunset’s Backstage Pass”, where they sing “Find the Magic” (with autotune, and eventually with their healed pendants) at the Starswirled Music Festival.