Written and first recorded by Floyd Dixon (1954).
Popular versions by Laurel Aitken (1961), The Blues Brothers (1978), Johnny Lee (C&W #2 1983).
From the wiki: “‘Hey Bartender’ was written and first recorded in 1954 by West Coast R&B pianist Floyd Dixon. The self-dubbed ‘Mr. Magnificent’, Dixon signed a recording contract with Modern Records in 1949, specializing in jump blues and sexualized songs like ‘Red Cherries’, ‘Too Much Jelly Roll’ and ‘Baby Let’s Go Down to the Woods’. Both “Dallas Blues” and “Mississippi Blues”, credited to the Floyd Dixon Trio, reached the Billboard R&B chart in 1949.