A couple that have recurred through my life are "The Last Thing On My Mind" by Tom Paxton (sometimes accused of being too cliche but never in my book), and "Early Morning Rain" By Gordon Lightfoot. If you are into international, there is "Proschai," a Russian folk song that I heard done by Theodore Bikel.

Wow, that is three posts for me involving memories all over 30 years old in one hour. Something in the air, perhaps?