Got forced into this today. And I surprised myself with my answers. Also surprised by how old everything on the list is. There was a time when animation was inventive and brave.
Twice Upon A Time (uncensored version only)
Mouse in Manhattan
Ralph Bakshi's Lord of the Rings gets an honorable mention.
No order. Mouse in Manhattan is perfect by the way. A 7 minute version of every MGM musical in the 40s to 60s. Animation is unreal. Brilliant!