Try this: Google the phrase, "influenced by Robert Johnson" -- then see how long it takes you to work your way through the results. Johnson may not have invented the blues, but his guitar playing and singing have inspired generations of musicians.
Born in 1911, Johnson made just 41 recordings before he was poisoned and died in his late 20s. According to the story, he attracted the attentions of a woman who had come to see him play -- and also the attentions of her jealous paramour, who apparently slipped something fatal into an open bottle of whiskey.