Well, I'll try to reiterate my problems with the story here in the hope it gets some answers...
The song came across as a poem yet it has a tune - why?
The nephew of Constastine is credited as keeping the song safe yet "Robbie" knows it and is given the "correct" version firstly by the aunt when he proposes to sing it and secondly by the nephew.
There even seems to be some ill feeling about people singing the "wrong" version.
How did this "wrong" version come about?