I have no doubt as has been said that Bert Lloyd and Ewan Maccoll et al changed things to make 'em fit!


We all do that - when I sang Jenny's Complaint I did it in Standard English, which is the last thing its author would have wanted (it's from a book of dialect poems). The charge against Bert Lloyd is that he not only altered songs but disguised where they came from, to the point of making up the names of the singers he'd supposedly collected them from. Steve Winick's article, linked from Dave's comment, has the details.