The swan song (ancient Greek: κύκνειον ᾆσμα; Latin: carmen cygni) is a metaphorical phrase for a final gesture, effort, or performance given just before death or retirement. The phrase refers to an ancient belief that swans (Cygnus spp.) sing a beautiful song just before their death, having been silent (or alternatively, not so musical) during most of their lifetime. This belief, whose basis in actuality is long-debated, had become proverbial in ancient Greece by the 3rd century BC and was reiterated many times in later Western poetry and art.
Origin and description
In Greek mythology, the swan was a bird consecrated to Apollo, and it was therefore considered a symbol of harmony and beauty and its limited capabilities as a singer were sublimated to those of songbirds.
Aesop's fable of "The Swan and the Goose" incorporates the swan song legend as saving its life when it was caught by mistake instead of the goose but was recognized by its song. There is a subsequent reference in Aeschylus' Agamemnon (verses 1444–5) from 458 BC. In that play, Clytemnestra compares the dead Cassandra to a swan who has "sung her last final lament". Plato's Phaedo (84d) records Socrates saying that, although swans sing in early life, they do not do so as beautifully as before they die. Furthermore, Aristotle noted in his History of Animals (615b) that swans "are musical, and sing chiefly at the approach of death". By the third century BC the belief had become a proverb.
Ovid mentions it in "The Story of Picus and Canens" (Metamorphoses, book XIV:320–396): "There, she poured out her words of grief, tearfully, in faint tones, in harmony with sadness, just as the swan sings once, in dying, its own funeral song." The swan was also described as a singer in the works of the poets Virgil and Martial.
The most familiar European swan, the mute swan (Cygnus olor), although not actually mute, is known neither for musicality nor to vocalize as it dies. This has led some to criticize swan song beliefs since antiquity, one of the earliest being Pliny the Elder: in AD 77, Natural History (book 10, chapter xxxii: olorum morte narratur flebilis cantus, falso, ut arbitror, aliquot experimentis), states: "observation shows that the story that the dying swan sings is false." Peterson et al. note that Cygnus olor is "not mute but lacks bugling call, merely honking, grunting, and hissing on occasion."
However, the whooper swan (Cygnus cygnus), a winter visitor to parts of the eastern Mediterranean, does possess a 'bugling' call, and has been noted for issuing a drawn-out series of notes as its lungs collapse upon expiry, both being a consequence of an additional tracheal loop within its sternum. This was proposed by naturalist Peter Pallas as the basis for the legend. Both mute and whooper swans appear to be represented in ancient Greek and Egyptian art.
The whooper swan's nearest relatives, the trumpeter and tundra swans, share its musical tracheal loop. Zoologist D.G. Elliot reported in 1898 that a tundra swan he had shot and wounded in flight began a long glide down whilst issuing a series of "plaintive and musical" notes that "sounded at times like the soft running of the notes of an octave".
Post-classical cultural references
In Shakespeare's The Merchant of Venice, Portia exclaims "Let music sound while he doth make his choice; Then, if he lose, he makes a swan-like end, / Fading in music." Similarly, in Othello, the dying Emilia exclaims, "I will play the swan, / And die in music."
The silver Swan, who living had no Note,
when Death approached, unlocked her silent throat.
Leaning her breast against the reedy shore,
thus sang her first and last, and sang no more:
"Farewell, all joys! O Death, come close mine eyes!
"More Geese than Swans now live, more Fools than Wise."
"The Swan Song" ("Schwanengesang") is the nickname of the 1733 Baroque Concerto written by Georg Philipp Telemann: Concerto in D minor for oboe, strings and continuo. The concerto of Telemann begins with a sad part (adagio) later a glad part (allegro), the singing of the swan itself, another sad part (death), and finally a hopeful end.
According to the Oxford English Dictionary, the English phrase "swan song" or "swan-song" borrows from the German schwanen(ge)sang or schwanenlied. The Scottish cleric John Willison, in one of his Scripture Sermons, 1747, proposes a verse from Psalm 48 as a "swan-song" for the faithful.
Samuel Taylor Coleridge made comic use of the legend when he quipped ironically:
Swans sing before they die— 't were no bad thing
Should certain persons die before they sing.
The wild swan's death-hymn took the soul
Of that waste place with joy
Hidden in sorrow: at first to the ear
The warble was low, and full and clear; ...
But anon her awful jubilant voice,
With a music strange and manifold,
Flow’d forth on a carol free and bold;
As when a mighty people rejoice
With shawms, and with cymbals, and harps of gold...
In the television show Supernatural, the twenty second episode of the fifth season is given the title Swan Song.
The first track of Canadian band Islands' album, Return to the Sea, is entitled Swans (Life After Death). 
By extension, "swan song" has become an idiom referring to a final theatrical or dramatic appearance, or any final work or accomplishment. For example, an athlete that wins a championship or breaks records in their final season are sometimes said to have had a "swan song season."
- Ray Bourque winning the Stanley Cup in 2001, his final season in the NHL.
- David Bowie's Blackstar, released just 2 days before his death from liver cancer in 2016.
- Kobe Bryant scoring 60 points in his final game.
- Ned Jarrett winning the 1965 NASCAR title and then surprisingly retiring.
- Derek Jeter's walk-off hit in his final game at Yankee Stadium.
- Peyton Manning winning the Super Bowl in his last season.
- Andy Pettitte throwing his first complete game in 7 years in his final start. By being credited with the win, he evened his 2013 record to 11–11, ensuring he finished his career having never recorded a losing season.
- Queen's 1991 song "The Show Must Go On" can be considered as a swan song for frontman Freddie Mercury, discussing his attitudes regarding his declining health from AIDS; Mercury would die of complications from the disease nine months after the release of the song's associated album, Innuendo.
- Nico Rosberg retiring from Formula 1 five days after winning his only World Drivers' Championship in 2016.
- Tom Searle from Architects writing Memento Mori as his final song before he died of cancer in 2016.
- Xavi winning La Liga, Copa del Rey, and UEFA Champions League during his last season for FC Barcelona.
- Aesop (1998). The Complete Fables. Penguin Classics. ISBN 0-14-044649-4., p.127
- Arnott, W. Geoffrey (October 1977). "Swan Songs". Greece & Rome. 24 (2): 149–153. JSTOR 642700.
- Brazil, Mark (2003). The Whooper Swan. T & A D Poyser. ISBN 978-0-7136-6570-3. pp. 64–65. (Online version)
- Ovid. "Metamorphoses (Kline) 14, the Ovid Collection, Univ. of Virginia E-Text Center; Bk XIV:320–396: The transformation of Picus". University of Virginia.
- Arnott, W. Geoffrey (2007). Birds in the Ancient World from A to Z. Routledge. ISBN 0-203-94662-6. pp. 182–184. (Online version)
- Peterson, Roger Tory; Guy Mountfort; P. A. D. Hollum; P. A. D. Hollom (2001). A Field Guide to the Birds of Britain and Europe. Houghton Mifflin Field Guides. ISBN 0-618-16675-0., p. 49
- Johnsgard, Paul A. (January 2013). "The Swans of Nebraska". Prairie Fire. USA. Retrieved 21 January 2013.
- Skeat, Walter W. (1896). Chaucer: the Minor Poems. Clarendon Press., p. 86 (Online version)
- da Vinci, Leonardo. The Notebooks of Leonardo da Vinci, Complete. Google. ()
- The Merchant of Venice, Act 3 Scene 2
- Othello, Act 5 Scene 2
- James Manheim. "Georg Philipp Telemann: Funeral Music for Garlieb Sillem". AllMusic.
- "swan, n." Oxford English Dictionary. June 2011. Retrieved 3 August 2013.
- "www.the-highway.com". Retrieved 3 August 2013.
- "Sal 217B". Statens Museum for Kunst website. Retrieved 8 February 2016.
- Tennyson, "The Dying Swan," The Early poems of Alfred Lord Tennyson (Project Gutenberg text), search on "shawm." This and other sources assert not merely that the swan sings, but that the song is beautiful.
- Matthew Naughtin, Ballet Music: A Handbook, p.210
- "swansong – definition of swansong in English from the Oxford dictionary".
- Waldstein, David (25 September 2014). "Night's Hero: Who Else?". The New York Times. Retrieved 12 April 2017.
- Marchand, Andrew (29 September 2013). "Andy Pettitte: A day 'I'll never forget'". ESPN. ESPN Internet Ventures. Retrieved 12 April 2017.
- Benson, Andrew (2 December 2016). "Nico Rosberg retires: World champion quits Formula 1 five days after title win". BBC Sport. Retrieved 12 April 2017.
- The dictionary definition of swan song at Wiktionary