My family enjoys Fantasia. When my two children were young, maybe 3 and 4, they were completely entranced by it. The 8 year old is now interested in other things than watching Disney movies with us, but my 7 year old is still entranced. She really enjoys movies that seem heavy on the music (Sing, Trolls, etc) and even though this is sort of different, it still held her attention. The first song, with the interpretive art, was a little difficult to keep interested in, and the dinosaur one was not up her alley, but from The Sorcerer's Apprentice through the rest of the movie she was enthralled. I enjoyed the whole thing.
Will update when we watch Fantasia 2000 ( )