The Hymnspiration today comes from a rather unknown origin, having no specific author and many different variations. However, "When the Saints Go Marching In", is normally referred to as a spiritual!
"O when the saints go marching in,
O when the saints go marching in,
O Lord, I want to be in that number
when the saints go marching in.
O when the sun refused to shine,
O when the sun refused to shine,
O Lord, I want to be in that number
when the sun refused to shine.
O when they crown him Lord of all,
O when they crown him Lord of all,
O Lord, I want to be in that number
when they crown him Lord of all."