This may not qualify, but while he was alive, there were not a lot of people who heard of him. As far as slide guitar, in the Blues genre, J.B. Hutto is recognized, around Chicago, but not too many other people are familiar with him. I was blessed enough to see him four times, he was amazing. He was not inducted into the Blues Hall of Fame until after his death. Jack White's use of a Montgomery Ward Res-O-Glas Airline guitar helped give J.B. the visibility he deserved.