Vladimir Tytla was one of the great Disney animators. He was just before the era of the so-called "nine old men," but is arguably better than any of them. Michael Sporn has a post where he examines two scenes Tytla did, one in Dumbo and the other in Night of Bald Mountain (from Fantasia), with frame grabs and drawings. In general Sporn observes:
animation, there was animation technique and styles. These rarely had anything to do with acting. However, there were a number of animators at the Disney studio who wanted to put the focus on their acting and actually studied Stanislavsky and Boleslavsky so that their characters would give a great performance. Tytla was certainly a leader among the animators to do this.
Of the Dumbo performance, which Sporn believes to be one of the greatest ever, he says: "Dumbo was gentle, all truth. The honest performance meant keeping everything above board and on the table. That is undoubtedly the performance Tytla drew."
And of the devil in Night on Bald Mountain:
The devil’s motion throughout this piece is very slow, tightly drawn images of the devil lyrically moving through the musical phases. It’s pure dance. Any distortion is done via the tight editing that Tytla has constructed. Very close images of the hands with the flame shaped dancers moving about in tight close up as Chernobog’s large face with searing eyes closely watching the fallen creatures dancing in his hands. It’s distortion enough.
Tytla has constructed the most romantic sequence imaginable, and the emotion of the dance acts as the climax for all of Fantasia, and it succeeds in spades. All hoisted by the animation, itself. No loud crushing peak, just a dance done in a tightly choreographed number completely controlled by Tytla. It’s the ultimate tour de force of animation, and we’ll never see the likes of it again.
My own verdict on this scene: "There’s a heft and grandeur in Chernobog that is worthy of Milton’s Satan in Paradise Lost. Without Tytla’s powerful acting, his powerful realization of Chernobog, Night on Bald Mountain would only be a magnificent swirling freak show. Tytla gave it the weight of Greek tragedy."