On record, the xx have a flair for getting power out of understatement. But it’s difficult to keep things subdued when a packed room at the House of Blues immediately begins screaming along to your first song, as was the case Thursday night. From the moment co-vocalist/guitarist Romy Madley Croft began the opening notes of “Angels,” an ethereal highlight from the band’s new record “Coexist,” there was a sense that the xx is bigger than its three members and sparse arrangements.
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