It's the Pied Piper, Charlie Brown (2000)

Name: It's the Pied Piper, Charlie Brown
Genre: Comedy, Family, Adventure, Animation, TV Movie
Released: 2000-09-12
Duration: 25 min
Cast: Quinn Beswick, Ashley Edner, Rachel Davey, Frank Welker, Neil Ross

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.