Always loved the irony in the fact that "Dixie" was written by a northerner, and "The Battle Hymn of the Republic" was set to a southern hymn.
Also interesting that while lots of the popular songs ("Rally 'Round the Flag" and "Just Before the Battle..." for instance) were composed songs written by professionals like George Root, and calculated to stir up public sympathies for one side or the other. But many were just made up songs that caught on with homesick soldiers and disrupted communities. Sara Grey sings "Goin' 'Cross the Mountains" on Folk Legacy, I do "Fare Thee Well, Sweet Mary" and there are more. Joan