This is the second video I did on this song The guitar is tuned to open E. now the history of the song says that Jimmy was tuned to open G and then the track was slowed down and so that is why its in F. Maybe so but my opinion would be that they laid the rhythm track down (bass guitar drums) then slowed down to F and then Jimmy went and laid the guitar track again and the overdubs in a tuning of FAFACF which is a open E 12 step up. I could be wrong but it only makes sense cus its the easiest way to play the slide on the song. Im only fretting the B and the D string for the main rhythm riff.