Minecraft wiki entry for Copper_Horn, associated text: Copper horns were used to play sounds. There were 10 variations of copper horns, and each of them played 3 different sounds: when looking up, crouching, or doing neither of those. In total, there were 30 different sounds that could be played using copper horns. When looking up, the copper horn played a soprano tune, when crouching, it played a bass tune, and when doing nothing, it played an alto tune.