Screw Gun Mules is a different poem. I mentioned it to support the view that he had tunes in mind for his poems. It starts like this

As me and my companions were scrambling up a hill,
The path was lost in rolling stones but we went forward still,
For we can wriggle and climb my lads and turn up everywhere,
And it's our delight on a mountain height with a leg or two to spare.
Keith