Thanks, MMario. The titles on the McKellar LP jacket and pressing label have "Falalolo" rather than "Falalalo," which brings up nothing in the DT.
From thread 39840, post by Malcolm, I presume that AR FALALALO would be better. Hugh Roberton is credited for the lyrics in the discussions by Giok and Malcolm, but not in the DT versions.

39840: Air fa la la lo

Is there another song with horo that the Guest is looking for?