"Knocking on Heavens Door" is a Dylan original, but you're right James GNR's version does kick ass. Although throughout all of the cover versions I heard from this song, No one can top Dylan, he is definitely one of the greatest songwriters of all time. When it all comes down to it, what matters is whether or not you're capable of constructing good solid melodies, and the rest should take of itself. Although I pride myself on being a great technical player, thats not all there is to the guitar, its all about timing and learning to let your ear guide you...

-Joseph,:)