This in the Guardian (h/t to Bart van Klink)
Until now, there were only two verified photographs of Johnson (1911-1938), who remains the most inspirational musician produced by the Mississippi Delta and the man Eric Clapton once anointed as “the most important blues musician who ever lived”. This weekend a third, newly cleaned-up and authenticated image has been released by the Johnson estate showing him standing next to musician Johnny Shines.