"Autumn Leaves" is an old jazz standard most famously sung by Nat King Cole. It's actually an English translation from the French original titled "Les Feuilles mortes" ("The Dead Leaves"). Not nearly as romantic, honestly. Either way, whenever I see the colors start to change, I always hear this song.
"The falling leaves drift by the window
The autumn leaves of red and gold
I see your lips, the summer kisses
The sun-burned hands I used to hold"