On a minor nitpicking point I think you'll find that SOTOTW goes back to even before the Chatmons, even if they arranged it the way it has subsequently mostly been done. As, for example, did a lot of stuff first recorded by the Carter Family and generally credited to them. This stuff's called traditional music . . .

Once upon a time the BBC had wonderful broadcasters like the late Alexis Korner who could be erudite and entertaining, who could hook you in, educate you without you realising it, and inspire you to make all sorts of other discoveries. Specialist programmes need presenters like that, with both a breadth of knowledge and great populist broadcasting skills. Having had Barbara Dickson sleep on your settee 40 years ago or having lurked around in the artist bar at Cambridge Folk Festival is minor stuff compared to that.

Where are the people today who have that breadth of knowledge like an Alexis and the ability to put it over for both the casual listener and the already expert? Not found (or wanted, probably) on the BBC any more, that's for sure.