So Long, Farewell was written by Richard Rodgers and Oscar Hammerstein II for the stage musical The Sound of Music, and it became widely known through the 1965 film, where the von Trapp children perform it for guests at a party before heading to bed. The song's simple, polite goodbye structure made it easy to quote, and short clips have since circulated online as a musical way to end videos, streams and edits. Its lasting appeal comes from that instantly recognisable farewell, which works as both nostalgia for the film and a light-hearted sign-off.