This music is composed by unknown authorRelative level of fame is: 62401
"When the Saints Go Marching In," often referred to as simply "The Saints," is a spiritual. Though it originated as a Christian hymn, it is often played by jazz bands. This song was famously recorded on May 13, 1938, by Louis Armstrong and his orchestra.
https://en.wikipedia.org/wiki/When_the_Saints_Go_Marching_In