DtG - haven't time to read this thread yet.. only your OP so far...

you know me by now.. very open minded and eclectic tastes in music...

In the 1970s in my early to mid teens I definitely considered Led Zep 111 to be a folk rock LP...

but then again, what did I know back then... my seductive gateway drug into 'folk' was Donovan and Lindisfarne.....