Many poets explored this romantic idea of a final flare of beauty before oblivion's embrace.
To him, it felt morbid. To remain silent from cradle till the twilight before death. To sing only in the moments of blurring into non-existence. In a way, he was restricted by his visions of what death holds.
However, much later, he found out that a swan song may not be so languidly heartaching.
To Socrates, " they sing more merrily than before, because of the joy they have in going to the Lord they serve." He awaited not darkness, but light.