It is said that no movie may ever surpass the book it was adapted from. It's wrong. Although it is completely incorrect to say that Soul Music, the animated film (or series, depends on how you watch it. :)) is better than the book, because they are two completely different kinds of media, Soul Music managed to capture a deep essense in the book and give it life. The result - a movie filled with humor and fun, with the sort of fiction you can only bring to life with animation. If you see the movie after reading the book, unlike with other book-based movies, you will most certainly not be disappointed, because since Pratchett himself helped direct the movie, he managed to recreate the Discworld down to the tiniest detail just the same way he did in the books.
Review of Soul Music
