I was listening to a long lost and forgotten tape and this song was on it, from a live album recorded in about 1966.

IT AIN'T NOBODY'S BUSINESS
As sung by Mississippi John Hurt on "The Best of Mississippi John Hurt" [live recordings] (Vanguard Records, VSD-19/20) (1970) (2:37)

Ain't nobody's dirty business,
How my baby treat me,
Nobody's business but mine.
Ain't nobody's dirty business,
How my baby treat me,
Nobody's business but my own.

Say, baby, did you get that letter?
If you take me back, I'll treat you better.
Nobody's business but mine.
Ain't nobody's dirty business,
How my baby treat me,
Nobody's business but my own.

Sometime my baby get boozy,
Then again she tries to rule me.
Nobody's business but mine.
Ain't nobody's dirty business
How my baby treat me,
Nobody's business but my own.

I said, sometime my babe get boozy,
Then again she try to rule me.
Nobody business but mine.
Ain't nobody's dirty business,
How my baby treat me,
Nobody's business but my own.