First recorded by Big Joe Williams in 1935 (on a nine string guitar)[youtube=http://www.youtube.com/watch?v=ikxLNaAYu5k&w=700]

Then Lightnin' Hopkins nailed it [youtube=http://www.youtube.com/watch?v=d49m6G9vOrI&w=700]

Here's AC/DC smoking away, with Bon Scott in drag - a ROCKING version [youtube=http://www.youtube.com/watch?v=1VlRUIHwygc&w=700]

And of course there's THEM (with Van Morrison up front) in 1971 [youtube=http://www.youtube.com/watch?v=d7qNnyF3wtQ&w=700]