Haskell Robert Sadler
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Haskell Robert Sadler, also known as Cool Papa Sadler (April 6, 1935 — May 16, 1994) was an American blues singer, songwriter, and guitarist.
Born in Denver, Colorado, Sadler played a number of times at the San Francisco Blues Festival. He was one of the members of the San Francisco Bay Area blues scene from the 1960s through to the 1990s.
He died in Berkeley, California in 1994.