It's Arbor Day, Charlie Brown is the 15th prime-time animated television special based on Charles M. Schulz's comic strip Peanuts. The subject of the special is Arbor Day, a secular holiday devoted to planting trees. It's Arbor Day, Charlie Brown premiered on the CBS network on March 16, 1976, which is near the dates in which most U.S. states observe Arbor Day. This is the first special to feature the character Rerun van Pelt (younger brother to Linus and Lucy), who had debuted in the Peanuts comic strip in March 1973. The musical score features the final compositions and recorded performances of Vince Guaraldi, a jazz pianist whose many contributions to Peanuts include the theme "Linus and Lucy". Guaraldi died on February 6, 1976—less than two months before the special's premiere. It's Arbor Day, Charlie Brown was distributed as a bonus feature on Paramount Home Video's 2003 DVD-Video release of It's the Easter Beagle, Charlie Brown (1974). A remastered version was published on DVD by Warner Home Video in 2008, and in the DVD box set Peanuts 1970's Collection, Vol. 2 in 2010. Plot Linus repairs his Mother's bike with Charlie Brown watching. Linus' Mother leaves with Rerun on the back seat. Rerun goes through all the places they are set to visit, including the Arbor Day meeting. After Sally Brown is humiliated in class for misunderstanding the purpose of Arbor Day (she defines it as "the day when all the ships come sailing into the arbor"), she is told that she has to write a full report on Arbor Day, and Linus goes with her to the library to help her with the report. Linus leaves the library after Sally's repeated attempts to make him fall in love with her. The scene cuts to Charlie Brown and Peppermint Patty talking under a tree. Patty asks Charlie Brown to explain love to her, before she cuts him out several times. She switches the topic to baseball, going over the time her team plays his team, confident that she will win over him every time. Sally, Linus, Lucy, Snoopy and Woodstock decides to plant a lush garden—in Charlie Brown's baseball field, despite Linus' protests. Lucy then calls in the whole team to help with the planting. Charlie Brown is unaware on what is actually going on, and stays at home to work on his team's strategy. The gang informs Charlie Brown