Question: Which American singer and guest star on Austin & Ally performed the song It's Goin' Down in the 2017 film Descendants 2?
Sentence (from "Sofia Carson"): In 2015, she appeared as Evie, the daughter of the Evil Queen, in the Disney Channel Original Movie, "Descendants" and reprised her role in its 2017 sequel, "Descendants 2".
Relevant evidence: No