[Delphster]

Forever Autumn — Justin Hayward - Moody Blues

[neverevergiveup]

Early Autumn - Ella Fitzgerald

[Psycho_Runner]

Forever autumn gets my vote

[Moonman62]

Forever Autumn — Justin Hayward - Moody Blues

https://www.youtube.com/watch?v=hsCdlX-5UjE

That was the first that popped into my head.

Another is The First of Autumn by Enya, an unusual instrumental:

https://www.youtube.com/watch?v=dGKUDMazLiI

[mdittmar]

Justin Hayward 'Forever Autumn' (Rare Video)

[Moonman62]

The melody was originally written by Jeff Wayne for a Lego commercial. His original occupation was a jingle writer. The performers added lyrics and released the first version in 1972:

https://www.youtube.com/watch?v=uev3KxhIbxE