Linus and Lucy is an original composition by pianist Vince Guaraldi, written in 1963 after television producer Lee Mendelson commissioned him to create music for a documentary about Charles M. Schulz's Peanuts comic strip. Mendelson had been captivated by Guaraldi's 1961 hit Cast Your Fate to the Wind and sought a piece with a similar breezy, melodic sensibility. The tune is named for two of the strip's central characters, the siblings Linus and Lucy Van Pelt. Written in A-flat major, the composition is built on an instantly recognizable boogie-woogie ostinato in the left hand that provides rhythmic momentum beneath a lively, syncopated right-hand melody. The form is a 16-bar structure with the A sections employing quartal voicings and modal harmony that create an open, bright harmonic palette, while the contrasting bridge section moves through more traditional jazz ii-V-I progressions. Guaraldi first recorded the piece in 1964 at Coast Recorders in San Francisco with bassist Monty Budwig and drummer Colin Bailey for the album Jazz Impressions of A Boy Named Charlie Brown on Fantasy Records. The composition achieved widespread recognition through its use in A Charlie Brown Christmas in 1965 and became Guaraldi's signature work. Its combination of melodic immediacy and harmonic sophistication has made it one of the most recognizable compositions in American popular culture, widely used in jazz education to introduce students to modal harmony, ostinato patterns, and improvisation. Guaraldi himself created numerous stylistic variations of the piece across subsequent Peanuts specials until his death in 1976.