From
Ted Gioia:
"This is blues legend Robert Johnson like you’ve never heard him before.
It showed up on YouTube a few days ago, and almost nobody noticed. Sound restorer Nick Dellow got his hands on a a shellac master test pressing of blues legend Robert Johnson. This disk had been made in 1940 from the original metal parts, which had been acquired by Columbia Records, and left forgotten in the company’s storage facility in Bridgeport, Connecticut.
The sound quality is stunning."