Yahoo: There is no sound more exciting than the industrial guitar riff that ripples through your body when you level up in 'Call of Duty' multiplayer. If you were to play it over the tannoy in your local supermarket then a strong percentage of the men strolling up and down the aisles would instinctively howl with joy. Last night, at an LA event letting the press play the multiplayer contingent of the upcoming 'Call of Duty: Black Ops', the howling was deafening.
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