J. R. DePriest 
:EA DATA. SF:My "movie that I saw when I was so young that I thought it might have been a fever dream" is "Rock and Rule".
"Fantastic Planet" is runner up.
YouTube
James Baker 🍁@RickiTarr This is as obscure as I can get, but the tunes Debbie Harry, Lou Reed, and Iggy Pop (plus Cheap Trick!) did for the early 80s Canadian animated masterpiece Rock & Rule… #MyNameIsMok