I think it was just called Mary Lass and I forgot to complete the song Here is the last verse:-
So if you want my consent to join Folk Club I'm afraid you'll be waiting a while If you ask me to pay your admission I'll answer you with a grim smile So practice your B Flat Brass Bass lass Build your embouchure up while you can Oh impetuous youth now I've told you the truth Just stick with your local brass band.