Statistics for occurrence #1 of “New-Orleans” in chapter 162, page 43 of Rebellion Record: a Diary of American Events: Poetry and Incidents., Volume 5.:

... were then paid off, and went to their work at once, singing the Old John Brown song, Marching on. This song is universal here and westward among the negroes, and is sung here at their churches in New-Orleans , on Sunday, at service.
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