What Disney Channel movie sequel had a song peak at 77 in the Billboard Hot 100?
It's Goin' Down (Descendants song):  The song peaked at number 77 in the Billboard Hot 100. Descendants 2: Descendants 2 is a Disney Channel Original Movie that premiered on July 21, 2017 on Disney Channel, and was simulcast on Disney-owned networks ABC, Disney XD, Freeform, Lifetime and Lifetime Movies.
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