Your original thread was still here (it's been amalgamated with the new one now), but only those which have been added to in the last day or so remain on the main page. Click on your name at the head of
your post, and you'll see a list of all the previous posts you've made under that name.

You don't make it clear what information you already have access to; but (assuming that you don't already know) I'd recommend -for a start- the Journals of the Folk Song Society and their successors (1899 to the present). Many collectors didn't keep a lot of details about their informants, but there's plenty to be had about people such as Henry Burstow (who also published an autobiography) and Henry Hills; and the Norfolk singers from the Sutton/Stalham area found by Moeran, Vaughan Williams et al. are reasonably well documented.

I assume from your recent posts that you are fairly well-informed; if you don't want to be told things you already know, you probably need to be a bit more specific.