"Tell me who's that riding? John the Revelator. Wrote the book of the seven seals."Son House has a version of that on the album from 1965. It's also on his CD in the "Mojo Workin'" series and, for the full effect, he's on video singing the song. I believe the video is on Shanachie, perhaps Yazoo. He does it a capella. Powerful.
Blind Willie Johnson also has a duet version of that great old song. I bet if you get around those church singers you'll find plenty of versions. Anyway, here's a couple to get you started.
Peace.