"Autumn Leaves", originally by Frenchmen Joseph Kosma and Jacques Jacques Prévert, probably best known with its English language lyrics by Johnny Mercer, is a masterpiece of dignified melancholy. That goes for this wordless jazz version as well. Miles Davis is the special guest star, but Hank Jones's piano solo strikes me as the most expressive part.
Incidentally, it's October and the nights (and mornings) are getting cooler, but most of the leaves are still green. Go figure.