Day Twenty-Nine: A movie from your childhood
There isn't really a plot to Fantasia. They took classical works of music and added footage to it. For example they took the song Dance of the Hours by Amilcare Ponchielli and shows hippos and crocodiles doing ballet together. Or The Pastoral Symphony by Ludwig van Beethoven which had some Greek mythological characters including Zeus, Bacchus the God of Wine along with centaurs and the such.
I can still sit down to watch this movie and love it. I would also suggest Fantasia 2000, which has the best of Fantasia along with new additions. Some of my favorite song... video.. things are from Fantasia 2000 - they really upped the A game for that one.