June 2019 edition of Real Life Rock Top 10: Robert Johnson, Erin Durant, Norma Desmond, Kelly Hunt, Pete Buttigieg, DJ Khaled, et al.
Rolling Stone, June 24, 2019
June 2019 edition of Real Life Rock Top 10: Robert Johnson, Erin Durant, Norma Desmond, Kelly Hunt, Pete Buttigieg, DJ Khaled, et al.
Rolling Stone, June 24, 2019
GreilMarcus.net 
It is possible and commonplace to prove a negative. I can easily prove that Greil is not asleep on my sofa at this moment. And the proposition “you can’t prove a negative” is itself a negative, so if it were true, you couldn’t prove it!
Hi Greil
I agree with some of your remarks regarding the Robert Johnson book but I’m curious about one of your comments.” Ignoring the testimony of the blues scholar Mack McCormick (1930-2015) and the blues guitarist Mike Bloomfield (1943-81) that the tale of Johnson’s deal with the devil was a widely shared and dispersed story going back to the 1940s” Where does this information come from?
Thanks
Frank
Thanks for the question, Frank. Greil addresses it in Ask Greil: https://greilmarcus.net/test/