Oh dear! *Anyone* can have access to sources. They're not secret. Though I do rather wish all revival singers would consult them and say which they have used, what compilations they have made and where that new tune came from.

And while I'm not much impressed with the singer who heard Joe Bloggs do it one way and trots out a copy, duff notes and mondegreens included, I'm a lot more irritated by the pseudo-scholar who hears Martin Somebody making up a line to cover up temporarily forgotten lyrics who then proceeds to proclaim it as a 'new variant'.

In each case a little research (even if it's just reading a Mudcat thread) and rehearsal would not go amiss.