Charlia Brown is the lead character of a television special written with a popular Christmas song written by who?
Christmas Time Is Here: "Christmas Time Is Here" is a popular Christmas song written by Lee Mendelson and Vince Guaraldi for the 1965 TV special "A Charlie Brown Christmas", one of the first animated Christmas specials produced for network TV in the United States. A Charlie Brown Christmas:  In the special, lead character Charlie Brown finds himself depressed despite the onset of the cheerful holiday season.
Lee Mendelson and Vince Guaraldi