Music elates, touches the soul and bypasses reason. Music is magic. But precisely this magic can turn it into an insidious weapon – for music and violence belong together. The brutal power of African war dances, the ferocity of Maori Hakas, the earth-shattering roar of US sound guns blasting Metallica at Taliban hideouts – the principle is always the same: Aggressive sounds demoralise the enemy and whip the allies into a frenzy.