Hi all,
I was thinking that Papa Egg Shell, Lawrence Casey of St. Louis, really qualified in this category. He had only four solo sides released, and they all showcase a very highly evolved individual guitar style--"high concept" with an interestingly varied use of the thumb in the right hand. He was a terrific player, and nice singer too, who lived into at least the 1960s, but was never recorded in that portion of his life, as far as I know (he may not have still been playing then). I believe he was known to be a playing partner of the St. Louis pianist, Henry Brown, whom he recorded at least one title with, too.
All best,
Johnm
