Parallel Anthology Track 52
Track 52: Blind Willie Johnson - John the Revelator Columbia 14530-D; Recorded in Atlanta, Georgia, 20.4.1930
The record label does not assign authorship, nor does www.78discography.com.
The Old Weird America and Where Dead Voices Gather blogs, as well as wikipedia, call this a "traditional" call and response song.
IN the absence of any competing claim to authorship, it seems reasonable to treat this composition as public domain.
Parallel anthology main index page
Alternative versions
John the Revelator by the Golden Gate Quartet recorded in 1961 (according to wikipedia): Spotify