The xx at Bank of America Pavilion

Oliver Sim (pictured in Port-ugal in May) and the xx per-formed Saturday in Boston.
Oliver Sim (pictured in Port-ugal in May) and the xx per-formed Saturday in Boston.European Pressphoto Agency/file

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Someone’s booking agent deserves a raise. The idea of the xx and Grizzly Bear touring together doesn’t make much sense, until you see the pairing live. Their styles fall on polar ends of the spectrum, but in a back-to-back setting, they make for a compelling match. One blows the balloon up, the other deflates it.

From London, the xx is essentially a trio of architects masquerading as musicians. Their songs are models of grace and economy, shot through with shimmering, repeating guitar lines and a tremendous amount of space. Nothing is out of place with this band, from the elliptical singing style of guitarist Romy Madley Croft and bassist Oliver Sim to Jamie xx’s throbbing sonic backdrops.

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