I used to sing this 50-odd years ago and the chorus went........
Air fa la la lo, horo, air fal la la lay,
Air fa la la lo, horo, air fal la la lay,
Air fa la la lo, horo, air fal la la la - ay,
Fa lee fa lo, horo, air fal la la lay,
(The 'Air' is of course the Gaelic pronunciastion 'err")