A bird sings the selfsame song,
With never a fault in its flow,
That we listened to here those long
Long years ago.

A pleasing marvel is how
A strain of such rapturous rote
Should have gone on thus till now
unchanged in a note!

--But its not the selfsame bird.--
No: perished to dust is he....
As also are those who heard
That song with me.

Thomas Hardy

http://www.poemhunter.com/poem/the-selfsame-song/