When Pink Floyd drummer Nick Mason got to London’s O2 arena last week, he had no idea that he’d be walking into David Gilmour and Roger Waters performing "Comfortably Numb" in a soundcheck for Waters’ show that night. "It hadn’t ever been quite finalized – there’d been talk about maybe playing in Paris or something else," Mason tells Rolling Stone. "So it was very nice to get there and see that [David] was there."

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