The British power pop quartet The 1975 plays the WaMu Theater on Thursday, April 28. The group’s No. 1 album, which came out in February, is titled “I Like It When You Sleep for You Are So Beautiful yet So Unaware of It.”

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The 1975, a group of four 20-somethings from the U.K., might be the most celebrated band you’ve never heard of. They’re bringing their syrupy brand of power pop to the WaMu Theater on Thursday (April 28).

The quartet released its second full-length album in late February, with the ungainly title “I Like It When You Sleep for You Are So Beautiful yet So Unaware of It,” which hit No. 1 on the Billboard album chart the same week Macklemore’s “This Unruly Mess I’ve Made” debuted (and peaked) at No. 4. The album overlays fast-paced falsetto vocals atop quirky, almost-underwater guitar riffs.

The 1975’s path to commercial success also includes four EP releases (the first of which came in 2012) and its eponymous debut LP. Of the EPs, lead singer Matthew Healy said he wanted the band to express range in its recordings before dropping a “long, ambitious” first full-length.

Given the band’s current appeal, it would seem his instincts have been vindicated.

8 p.m. Thursday, April 28, at the WaMu Theater, 800 Occidental Ave. S., Seattle; $36.95 (800-745-3000 or ticketmaster.com).