Roy Byrd was Professor Longhair - not a small name, Ubu.
Julia Lee was an even bigger name than Longhair, in the '40s - 13th biggest selling R&B artist of the decade. Very, very cool lady. I wasn't aware she'd ever recorded for Mercury; she was mostly on Capitol. What is on your box must have been some early material recorded for a tiny label in Kansas City in '45. What's the track title?
MG