BCDB: Cartoon Reviews: The Blue Danube

I saw "The Blue Danube" only once, and years ago, but remember it as the story of underground elves who wake in winter and, through a sort of essembly line, create spring. There is little or no dialogue in the cartoon, and it is set to 'The Blue Danube' music from Strauss. The cartoon is remarkably charming and it has always stood out in my memory.