Several. I'm glad the Carter Family's "You've Been A Friend To Me" was cited; beautiful. "She Moves Through The Fair" has wonderful imagery. Cisco's "Girl in the Wood" is magic. Doc Watson's sad "Alberta" I like too. Another sad one but with hope is Jez Lowe's "Last of the Widows". But my favourite must be Phil Ochs singing his own composition "Celia". "The First Time Ever I Saw Your Face" is mentioned by many: a bit crude I think, needs a bit of folk process!