The document discusses three popular Civil War-era songs: "That's What's the Matter" written by Stephen Foster in 1862 to appeal to Union soldiers, "Battle Cry of Freedom" which inspired the Union after being published in Chicago in 1862, and "Marching Through Georgia" composed by Henry Clay Work in 1865 about General Sherman's march through Georgia that devastated the region. It provides lyrics for each song that reference the Union cause and defeating the Confederacy.