doctorwho
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It's definitely B or C. Hitting those high "Woo-hoos" as the first notes of a concert are really tough! He'd need to warm up his voice for that. Heck, even the JT-era Bono couldn't always hit those high "woos" without scratchiness or his voice cracking (see R&H performance of "Bad"). So it's clearly a backing track there, with Bono perhaps singing over it slightly. But as soon as the "woo-hoos" are done, it's his voice. And that's fair.