That would be a jazz standard by Johnny Mercer and Joseph Kosma, two verses in English and one in French (Mais la vie sépare ceux qui s’aiment/Tout doucement sans faire de bruit), awfully pretty and sad, just like, well, autumn leaves. I have pictures.
Mind you, they’re just getting started, by the time they fall the rains will have set in, we end up shoveling rather than raking them. But right about now they’re pretty.