This is from a lecture given by Glen Keane at CalArts. Watching an animator at work is usually as exciting as watching paint dry, but Glen narrates his process as he works. Keep an eye on how much he rolls the drawings to see the motion and how he adds elements to successive drawings rather than finishing one drawing at a time. He is drawing motion, not making drawings move.
Glen Keane animates a scene part 1
Glen Keane animates a scene part 2
Glen Keane animates a scene part 3
These videos were posted by cookedart.