I'm wondering how the seeming nonsensical words used by PP& M (e.g., "shule a rack shack, shule a bobba coon") evolved from the original Gaelic words to Suil a Ruin or Suil Agra.    I can see how "suil" became "shool" of course, but there seem to be some missing links between the Gaelic versions posted here and the versions by PP&M, Chubby Parker, etc., that seem to use nonsense syllables in the chorus.