How does having pictures fit the music change the film from most that have soundtracks to fit the film?

As the film begins, we meet watch different musicians walk onto the scene - how does this set the stage for the movie?

What was Fantasia's original purpose?

In the big scheme of the film is the best known part with Mickey Mouse all that important?

How do the artists express their feelings in the music?

What are the three types of music used in the film?

In what ways is the music expressed by the artists? Why is this important?

How is Fantasia held together between the different selections?

Do the sections representing stories or real scenes seem to be more important than those that use only the feelings and imaginations of the artists?

What is the final theme that is presented at the end...