Song of the South (1946) IMDb
Seen in 2018.
Cel-and-live-action combination. Apart from the catchy “Zip-a-Dee-Doo-Dah” and the message that it is OK for children to discover some happiness outside of their economic class and nuclear family, this is all remarkably boring.
References here: The Adventures of Ichabod and Mr. Toad (1949).