Here’s a great segment from Disney’s 1946 “Make Mine Music”: All the Cats Join in. It’s fabulous.
The background is very minimal. It’s drawn in place as the characters need it. This piece is very much about how the characters convey the excitement of the music, some hot Benny Goodman jazz. The enthusiasm of these kids is positively contagious, as they rear back and fling themselves from point A and go skidding and scrambling while overshooting point b every time. And great non-rotoscoped dancing. I dig it.