Why is a Final Performance Called a “Swan Song”?

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In this video:

When someone performs for the last time, we often refer to it as a “swan song” which seems odd given that swans aren’t particularly known for their stage presence… So where exactly did this phrase come from?

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Sources:

http://bestiary.ca/beasts/beast237.htm
http://www.ancientgreekphilosopher.com/2012/07/10/socrates-swan-song/
http://grbs.library.duke.edu/article/view/12881/3797
http://www.phrases.org.uk/meanings/swan-song.html
http://www.academia.edu/4273145/Socrates_16_Phaedo_last
http://bird-guide.l-studio.gr/sp.php?ln=en&sp_id=3
http://link.springer.com/article/10.1007%2FBF01003503
https://en.wikipedia.org/wiki/Swan_song
http://www.worldwidewords.org/qa/qa-swa5.htm
http://link.springer.com/article/10.1007%2FBF01003503
https://en.wikipedia.org/wiki/Swan_song
http://www.worldwidewords.org/qa/qa-swa5.htm
http://www.etymonline.com/index.php?search=Swan+song
http://www.etymonline.com/index.php?term=swan
https://en.wiktionary.org/wiki/swan_song
http://english.stackexchange.com/questions/210042/etymology-of-swan-song
http://www.word-detective.com/2013/09/i-swan/
http://www.ancient.eu/article/664/
https://en.wikipedia.org/wiki/Aesop
https://www.umass.edu/aesop/history.php
https://en.wikipedia.org/wiki/Aphthonius_of_Antioch
https://books.google.com/books?id=zO0OAAAAIAAJ&pg=PA259&lpg=PA259&dq=King+David%27s+Swan-Song+Jon+Willison&source=bl&ots=8nWcwsr9zm&sig=fDLLLNGt9nhvxsRsaz2bsun5MkQ&hl=en&sa=X&ved=0ahUKEwiY1cnk8_3KAhUP0GMKHTbMDhMQ6AEIKDAC#v=onepage&q=King%20David%27s%20Swan-Song%20Jon%20Willison&f=false
http://www.prdl.org/author_view.php?s=20&limit=20&a_id=3146&sort=
http://www.the-highway.com/Five_Sacramental_Sermons2.html
https://en.wikipedia.org/wiki/John_Willison
http://www.worldcat.org/title/balm-of-gilead-consisting-of-sermons-preached-on-various-occasions-likewise-sacramental-meditations-and-advices/oclc/21318726
https://books.google.com/books?id=TlWggaqnaZEC&pg=PA117&lpg=PA117&dq=Five+Sacramental+Sermons+john+willison&source=bl&ots=5Fej451Qh8&sig=gS7MbkXfbO249tU1EgAJ92mq2AI&hl=en&sa=X&ved=0ahUKEwjjhKDo-_3KAhVO9GMKHQrQBRMQ6AEIOTAF#v=onepage&q=Five%20Sacramental%20Sermons%20john%20willison&f=false
https://en.wikipedia.org/wiki/Schwanengesang