Dear Nerd

Thanks for the suggestion. I listened again to the Woody Guthrie version (another excellent variant of the same song) and though the words have quite a lot in common, the tunes are greatly different. The WG tune fits to a major chord sequence (as do most of the other versions that I have come across) but the Dylan tune has a distinctly minor or modal feel to it. Here I run across the limitations of my musical knowledge, could Dylan have somehow modalised the tune, or does another elusive source exist? I would love to know, and live in hope that there is an expert somewhere on line who has this sort of knowledge at their fingertips.
Many thanks for the reminding me about the WG version anyway.
All the best Bill