Which Davy Graham pieces in particular?

I think he got much of his odd stuff from Moroccan music? Easy enough to find documentation on that these days, you don't have to travel 2000 miles south and a few thousand spliff-lengths skywards to investigate it.

Flamenco is the one I find really baffling. The time signature is pretty near always 12/8 but the internal subdivisions and accents are all over the map.