"I'm So Glad" is a Delta blues-style song originally recorded by American musician Skip James in 1931. Blues historian Gerard Herzhaft notes "This spiritual probably dates back to the beginning of the blues". Blues writer Stephen Calt describes it as "a Two-Step piece marked by fiendishly fast playing [in] an eight bar arrangement comprised of [sic] single measures." He adds it is not related to an earlier Lonnie Johnson tune.