You're a Good Man, Charlie Brown (1985) on Netflix

Plot summary

The Peanuts gang stages the 1967 musical named for Charlie Brown, opening as the others sing its title song to him. Schroeder performs the Moonlight Sonata and Lucy adds her voice to it, then puts the idea of marriage to him; he pays her no attention, and she decides that her aunt Marian was right about discussing marriage with a musician. Charlie Brown flies a kite and hopes to keep it this time. Sally writes a letter about a valentine she has received. Charlie Brown hands Lucy a valentine and wishes her a Merry Christmas instead. He spots Marcie and waits for a valentine that does not come. Snoopy pictures himself as a wild animal.