How about another theory added to the mix...? Regional Bluegrass...what is considered and revered as bluegrass in one part of the country maynot be as readily accepted in other parts. Some of the 'newgrass' I have heard called Bluegrass here in Florida would probably never fly in say, Rosine, KY. In a generality it is all bluegrass in the sense that it derives from the same old time music that we know from the 20's and 30's but has taken different paths. I guess what I am trying to say here is the folk process is alive and well in the genre.