This sounds like magic! Lomax's Mr Jelly Lord is another book I loaned to someone and never saw again.
There is a musician here in the UK called Martin Litton who has, in the past put on a show called Mr Jelly Roll, which is based on an 'interview that never happened'.
After Robert Ripley introduced W C Handy as 'the inventor of the blues' on his 'Believe it or not' radio show, Jelly wrote to him pointing out that he was the only true and original inventor of jazz and the blues. Ripley never interviewed him, but the show is based on what would have happened if he had. It has a two man cast (Jelly & Ripley) and a band playing the music. I caught it at The 100 Club in a previous life.
It was produced by a company called 'Jazz & Arts Directions'

FC