Francis Clay , was a jazz and blues drummer, best known for his work behind Muddy Waters in the 1950s and 1960s and as an original member of the James Cotton band. Clays jazzinfluenced style is cited as an influence by many of the British Invasion rock n rollers of the 1960s such as Charlie Watts and Ronnie Wood of the Rolling Stones and Faces, respectively.
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Source: Wikipedia