"Old Joe Clark" is a US folk song, a mountain ballad that was popular among soldiers from eastern Kentucky during World War I and afterwards. Its lyrics refer to a real person named Joseph Clark, a Kentucky mountaineer who was born in 1839 and murdered in 1885. The "playful and sometimes outlandish verses" have led to the conjecture that it first spread as a children's song and via play parties. There are about 90 stanzas in various versions of the song. The tune is based on an A major scale in the Mixolydian mode, but moreover has definite hints of a complete blues scale, namely, the flatted 3rd and 5th.