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 sing a beautiful song just before their death, having been silent (or alternatively, not so musical) during most of their lifetime.
I read Bowie's last album was intentionally recorded I'm his dying days to be his swan song, a final parting gift to us.
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