Willie Brown is featured with Son House (and Joe Martin and Leroy Williams) on "Deep River of Song - Mississippi: The Blues Lineage" feild recordings of Alan Lomax. The four are performing walking blues. That's all I've found. I asked Sparky Rucker that same queston and he told me that most of his work was supporting other players. There are about six (if I remember correctly) records he put out. I wish I could remember more of what he said. If you can contact him, he'd be a great source.