Blind Willie Johnson
There's a lot to say here, and I might have to spread this out in to a couple of posts, but we'll start here.
Here are the 30 songs Blind Willie Johnson recorded:
https://archive.org/details/BlindWillieJohnson/02+JesusMakeUpMyDyingBed.mp3
Yep, Just 30. Over 5 recording sessions from 1927 - 1930.