Greil Marcus just did a talk last week about his latest book including talking at some length about Geeshie Wiley's "Last Kind Words Blues"
https://greilmarcus.net/2016/06/03/three-songs-three-singers-three-nations-talk-at-google-060316/
https://greilmarcus.net/2016/06/03/three-songs-three-singers-three-nations-talk-at-google-060316/