Adding irrelevantly (and irreverently) to my earlier post, I think that there are certainly riches in post-war Bill Monroe too! Maybe not in lyrics, but in ambience, harmony, etc. Well outside of bluegrass cliche history. I know it is a ridiculously banal thing to say, but he was an amazing figure (if a somewhat irascible human being). All those strange experiments he did (My Last Days on Earth, Scotland) and other things. Way out there. And from the person who was supposed to be a bearer of the trad flame.
yours, Peter T.