I've just watched one of the most beautiful stop-motion claymation films ever. It's a Czech adaptation of the old German folklore, The Pied Piper of Hamelin, where the beautiful music from a piper's pipe leads the rats of a rat-infested town to their deaths, then the piper leads the townspeople's children away in retaliation for not getting paid.
The films original Czech name is Krysař (The Rat Catcher) and its English title is The Pied Piper. Filming was complete in 1985 and was released in 1986. The ending is different than any previously written versions, as far as I know. It's dark, haunting, creepy, and so so beautiful.
Please watch the twelve minute making-of below.