Sam & Dave
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Sam & Dave were an American soul and rhythm and blues (R&B) duo who performed together from 1961 through to 1981. The tenor (higher) voice was Samuel David Moore (born Samuel David Hicks on October 12, 1935), and the baritone/tenor (lower) voice was Dave Prater (May 9, 1937 – April 9, 1988).
source: Wikipedia