I have recently been obsessed with this song. I actually came across it on a pandora station and immediately began to research it because it haunted me. However, I had the hardest time finding it because, as the title(s) show(s) there are multiple different names for this song and each arrangement of it has been called something else by each different artist performing it. The song, originally from Davey Graham, has been covered but other such musicians as Paul Simon and Bert Jansch.
I hope that you too become captivated in the same way.
Relax and listen well.