William Shakespeare helped popularize this concept in English literature, notably referencing a character's final fading music in *The Merchant of Venice*.

Ancient Greeks believed these birds were sacred to Apollo, the god of music, and would sing a tragic, beautiful hymn just moments before their death.

Mute swans lack the specialized vocal cords of other swan species, relying on aggressive hissing to defend their nests and low grunts to communicate.

Promoters often market final global tours as swan songs to emphasize that an aging performer is genuinely stepping away from public life forever.