It's the Pied Piper, Charlie Brown
"Here come the mice!"
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.
Genres: Adventure, Animation, Comedy, Family
Directors: Bill Melendez
Writers: Charles M. Schulz, Robert Browning
Cast
IMDB: tt0203593