Anyone who has ever learnt a song,forgotten a bit,made a bit up to compensate then had that song taken up by someone else has contributed to folk process. I would dare to suggest that this is a more than daily occurence.
Whilst some art music may exist in a definitive recorded form,Dylan's live performances seem to indicate that his recordings are merely a record of what the song sounded like that day.
(I mean all of the above in a good way.)