Spanish musician and composer Pablo Casals, playing the cello in 1936. Fox Photos/Getty Images hide caption

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Robert Johnson And Pablo Casals' Game-Changers Turn 75

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One of the two known photos of Robert Johnson. This portrait was taken by the Hooks Bros. Photography Company in Memphis, Tenn., circa 1935. Courtesy of the Delta Haze Corporation hide caption

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Robert Johnson At 100, Still Dispelling Myths

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One of the two known photos of Robert Johnson. This portrait was taken by the Hooks Bros. Photography Company in Memphis, Tenn., circa 1935. Courtesy of the Delta Haze Corporation hide caption

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A Blues and Country Collection for Collectors

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Eric Clapton Takes on Robert Johnson's Blues

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One of two existing photographs of Robert Johnson. Courtesy of the artist. hide caption

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'Hellhound On My Trail'

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