I first heard this song performed by the Cream. Most recently I heard it being covered by a local bluegrass band and discovered that Bill Monroe had given it a whirl. Harry Belafonte and Frank Sinatra also reworked it. I've researched this myself and come up with conflicting information. Is there anyone out there who knows who wrote this song? Here's a clue the initials of the outfits who are credited with it are MS and HW. This one's for you Jonny boy!