Another identification in the Robert Johnson video Hayes McMullan

The publisher of the blues music news service, a self proclaimed bluesicologist has identified a fourth in the group of five delta blues singers in the 1929 Fox Movietone News Story previously popularized on youtube as the Georgia Field Hands video as Hayes McMullan, the only other singer to take a verse by himself in the song besides Robert Johnson, whose recordings made in 1967 by musicologist Gayle Dean Wardlow in McMullan's Tallahatchie sharecropper's shack weren't released until 2017