101 Dalmatians wasn't an animated musical. It was a movie with music. Only two or three songs, as the case with a lot of Disney movies: Pinocchio, Snow White, Peter Pan, Alice & Wonderland, etc.
However, this doesn't mean a Disney 'movie with music' couldn't be adapted. The danger is keeping the story and writing new music to fit it.
"The Spectacle has, indeed, an emotional attraction of its own, but, of all the parts, it is the least artistic, and connected least with the art of poetry. For the power of Tragedy, we may be sure, is felt even apart from representation and actors. Besides, the production of spectacular effects depends more on the art of the stage machinist than on that of the poet."
--Aristotle