How 'The Battle Hymn Of The Republic' Became Everybody's Anthem

"It's a good march," says Sparky Rucker. A folk singer and historian who performs a show of Civil War music with his wife, Rucker says the "Battle Hymn" rallies with its rhythm: "It's just the right cadence to march along, if you're marching at a picket line or marching down the street carrying signs. ... It really gets your blood going [so] that you can slay dragons."