It's a good thing (blues recordings, 1920s)

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   I did a quick title search.

1890s--"It's a good thing I did'nt hav my gun" is in WILLIAMS & PEMBERTON'S NEW CONSOLIDATED SONGSTER (1890s, undated).

1920s-1930s--"It's a good little thing" is in music collections by Blind Willie Johnson and Blind Willie McTell.

1927-1929--"It's a good thing" is in music collections by Frank Stokes.  One 1970s collection is titled "Frank Stokes: Creator of the Memphis Blues."

1927-1932--"It's a good thing" was recorded by the Beale St. Sheiks.  Same tune as above?  It's in the 1970 collection "Hometown skiffle: early folk blues vol. 2."

1964-1967--"It's a good thing" was recorded by Jimmy Hughes.  Martha might have been exposed to this 1960s NYC "soul music" recording.