Keltentrauer is a song by the Danish band Heilung that tells the story of a battle between the Romans and the Celts. The lyrics describe the peaceful hills of the morning being disrupted by the sound of Roman soldiers preparing for battle. As the sun rises, a horn sounds and both sides prepare for the fight. A warrior from the Celts steps forward and challenges the Roman commander to a one-on-one fight. The Roman commander agrees, and the warrior is killed. The Celts continue to fight, but the Romans ultimately win. The song captures the brutality and horror of war, as well as the cultural clash between these two historic groups.