It's the Pied Piper, Charlie Brown
Here come the mice!
9/12/2000
Imdb: tt0203593
Tmdb: 35020
Popularity: 4.252
Vote: 7.7/10 (22)

Based on the legend of the Pied Piper, it stars Snoopy as the title character, who tries to rid the Peanuts' gang's hometown of mice by playing his concertina, in return for a year's supply of dog food.