Performed by the Disney cast in the 1964 film Mary Poppins, this iconic musical number serves as the film's climactic finale. The song, composed by Richard M. Sherman and Robert B. Sherman, showcases the ensemble's vocal prowess with its rapid-fire, nonsense syllables that build to a triumphant crescendo. It exemplifies the film's whimsical style and remains a defining piece of Disney musical theater history. The track has transcended its cinematic origins to become a global cultural touchstone, frequently covered by artists across various genres and celebrated for its unique rhythmic complexity and memorable melody.