This is a medley of 'The Girl I Left Behind Me' and 'Simple Gifts'. The first tune originated in he Brithish Isles but by the time of the American Civil War it was used as a marching tune by both sides. 'Simple Gifts' made the journey the other way. It started out as a Shaker dance tune but was adopted as the melody for a hymn by the English songwriter, Sydney Carter, and became 'Lord of the Dance'.