The Rev. Charlie Jackson (on edit; I got him confused with Charlie Patton, a different blues singer from a different era) is, criminally, only represented by two songs on all of the wormhole into the universe that is Youtube. Here he is singing, in England, a song that perfectly intersects the 'dirty blues' and gospel. Listen for the fishing line references.
Also, please point and laugh at the suit the host of the show is wearing (could he have chosen a worse color for his skin tone? I think not--he looks like a unaccountably pasty banana.) Cringe along with me at the deeply condescending comments from the host that the good Reverend answers with such kindness and grace I'm planning on watching the early painful part as a lesson on how to be a better person. But wait! The music!