[Pinetreebob]

I was trying out a new capo and I was moving it up and down the neck to see how well it works. I was at the fifth fret and idly plucking and playing different chords. Suddenly, under my fingertips, a chord progression magically formed. To my ears it sounded great and I thought I might have something here. I also started fleshing out some lead fills and it all was working.
It occurred to me that the placement of the capo might be making it sound better than it really was so I removed the capo and did the progression in the first position. It still worked so excitedly I got my notebook out and jotted down some notes so I wouldn't lose this magic. After I captured it on paper I went back to my guitar and continued fleshing out this little song fragment. I kept working on the progression and a possible intro and I decided to work out a melody. I started humming over the progression and like a lightning bolt (to my dismay) it struck me that I was writing "Knocking on Heaven's Door".