If you sing Sacred Harp (also known as Shapenote), which I do, you'd know Babylon is Fallen as Number 117 in the Denson 1991 edition of "The Sacred Harp". I sang it on the weekend at the Sydney Shapenote All Day sing - it is a cracker! Just do "Youtube Sacred Harp Babylon is Fallen" and enjoy it (note that Sacred Harpers sing the shapes then the words).