[78-L] Roots of "It's Tight Like That" 1919

[Joe Scott]

For all we hear about AAB lyrics in blues, many many blues don't use AAB, and one of the other structures that was already around in the 1910s uses the same refrain in each stanza, occupying the last eight bars of the twelve bars. One of the most famous examples of that approach is the big hit "It's Tight Like That."
Here is Al Bernard using that approach in 1919:
http://www.youtube.com/watch?v=H2vIOuftDQw 
and Papa Charlie Jackson in 1925:
http://www.youtube.com/watch?v=4QsL5OGfTlo 
Via people like Louis Jordan this approach remained well-known and thus was commonly used in the "Rock Around The Clock" era. The jaunty singing style in all these is reminiscent of Al Bernard's (as blues goes). Imo the sometime association of the word "hokum" with all this stuff is overrated, considering that the real meaning of hokum back in the day was basically cornball, and I don't think a hip New Orleans singer like Bernard is the same thing as cornball.
Does anyone know of any 12-bar tunes that use that eight-bar refrain approach and apparently date before "Hesitation Blues" (a folk song that several pro songwriters adapted)? Lots of 12-bar tunes before "Hesitation Blues" used refrains occupying the last four bars (e.g. "Frankie And Albert," "Railroad Bill," "Fightin' In The War With Spain").
Joseph Scott