Essentially a subjective list, but not sufficiently eclectic for me. I would subjectively suggest (not in any particular order):

Canon in D (Pachelbel): The Great Silkie (Trad): Londonderry Air (Trad) : Nimrod from Enigma Variations (Elgar) : Both Sides Now (Joni Mitchell) : I've Had Her (Phil Ochs) : Don't Cry for me, Argentina (Lloyd Webber) : The First Time Ever I saw your Face (Ewan McColl) : Planxty Irvine (Trad/Carolan) : It Was A Very Good Year (Drake) : Here's That Rainy Day (Van Heusen) : Autumn Leaves (Prevost)