I have been going back through and re-watching the Top 10 Animated Movies (as according to AFI) and reviewing them for my list (http://dinojim.com/Cultural/Movies/10Top10.html).
The final film in this list is Fantasia. You can also find this on the 100 Greatest Movies List.
Fantasia is Disney's third animated theatrical release (after Snow White and Pinocchio, both on this list as well). I think it is telling, that of Disney's first five animated movies, four are on the top 10 animated movies of all time list. Nothing encapsulates that drive to create unique animated features more than Fantasia. This movie shows how Walt Disney was willing to break with normal traditions and go as far out there as he could think. This movie could in essence be considered the first music video, where eight different pieces of classical music are given animations that match the music. The themes of the animations range from nonsensical shapes and colors, through Greek Mythology, to scientific theories, to religion, and ballet. Each of the pieces has a unique style to it, but they all appear to have that "rough" animation style that was so prevalent on Pinocchio. I actually tend to prefer that style of animation, which gives the movie a more artistic feeling. And this movie definitely has an artistic feeling. At over two hours in length, it is one of the longest Disney animated movie ever made but it is broken up by a live action conductor and narrator, who introduces each of the segments to the audience. This movie also has one of the first interactions between a cartoon and a live actor, almost 50 years before Who Framed Roger Rabbit. Overall, I would say that this is an enjoyable movie, with interesting animated sequences, but it is very very long, and I definitely felt it dragging the latter half of the movie.