I haven't seen "The Fall of Charleston" (Whack, Row De Dow) listed yet. It's a particularly nasty jab at the Confederacy. A good "one-stop shopping" book that has all the popular songs and their parodies is "The Civil War Songbook" by Irwin Silber. (I said it before and I'll say it again.) Go to any library and it will be there. Or get one yourself on the cheap at Dover books.

Rex