I'm not much of a football fan, but tried to watch a bit of the Germany/Australia game and had to give up as the constant drone (in B flat below middle C, I believe) brought on a huge headache. As soon as I left the room it went away. Strange! Is this a traditional instrument, maybe used by the Zulus to intimidate their enmies in battle (like the bagpipes)? I lived in South Africa for 2 years and never came across it before.