Rap would appear to stemmed from something that might have been folk and maybe the "urban culture" might add to this but I think that is as far as it goes. Was punk part of a cultural movement and could it justifiably be considered folk.Frank, is contemporary folk singing folk? - it too follows those principals but I thought that you have argued against that. Is commercial recording folk? - I thought that you had argued against that.
To me, I don't care, I like what I like and I DETEST rap and if it is folk, I will have to come up with another word to describe what I do like.
Jon