The Charlie Brown soundtrack was a masterpiece at the time, it still is today and it really fit the cartoon. It's a major reason I decided at a very young age that jazz would be something I would listen to in the future.
https://www.cbc.ca/news/canada/nova-scotia/jerry-granelli-jazz-musician-dies-at-80-1.6110699
https://www.cbc.ca/news/canada/nova-scotia/jerry-granelli-jazz-musician-dies-at-80-1.6110699