Western Swing: July 2019 Archives
Song: Rag Mop written by Johnnie Lee Wills, Deacon Anderson | SecondHandSongs
This website tracks the genealogy of derivatives and cover versions of songs, back to the originals.
This particular entity links "Rag Mop" to the song "Get the Mop" by Henry "Red" Allen, which includes the spelling out of "M-O-P-P" and the repetition of "mop, mop, mop, mop." A comment on this entry states, "Allen sued and won the plagiarism case."