Sorry, I'm not a leadbelly fan, but I have a recording saved from the 1960s that seems related to what you folks have posted. It's definitely not Leadbelly, but sounds to me more like Dave van Ronk.

The first few lines, as best as I can make out, are:

Sometimes I fly the ol' grey mare.
Sometimes I fly ol' mulee-o.
Soon as I get this cotton crop out,
I'm goin' home to Julie-o.

Whoa back buck and gee by the lamb.
Who made the back band Cunningham.
When was . . . . . . by in.
Carving my initials in a mules behind.

Anyone know the artist or title?

Bob O