The landmark recording of the American gospel hymn “When the Saints Go Marching In” was produced in 1938 by Louis Armstrong and his orchestra. Undoubtedly, Americans over the age of thirty can immediately hear the tune in their heads: “Oh, when the saints go marching in… Lord, I want to be in that number, when the saints go marching in.” But what most people do not know is that the lyrics were inspired by the biblical book of Revelation and other parts of Scripture.