When the Saints Go Marching In

"When the Saints Go Marching In", often referred to as "The Saints", is an American gospel hymn. The precise origins of the song are not known. Though it originated as a Christian hymn, it is often played by jazz bands.

This song was first recorded on May 13, 1938 by Louis Armstrong and his Orchestra.The song is sometimes confused with a similarly titled composition "When the Saints are Marching In" from 1896 by Katharine Purvis (lyrics) and James Milton Black (music).