Ashleigh Ball, lead singer of Hey Ocean! provides the voice of Rainbow Dash. I would love to see her other band members, David Beckingham and Vertesi on the show. They could play Rainbow Dash's competitors, Applejack's other relatives, one of the Wonderbolts, some siblings or even better, seaponies with a band that's a parody of Ashleigh's real life one.
But what should we call them?