Charli XCX was the only act at this month's KIIS-FM Jingle Ball to end her set as the leader of a punk band might, slamming down her microphone and stalking offstage with a scowl on her face. But the British singer's unruly attitude made sense, given that her bratty new album, "Sucker," which came out the week before Christmas, feels like a punk record masquerading as a big-ticket pop release.
Her second major-label disc following 2013's dreamier "True Romance," "Sucker" arrived at the end of a transformative year for Charli XCX, who as a songwriter scored huge hits with Icona Pop's "I Love It" and Iggy Azalea's "Fancy," which also features her sneering vocals. The latter is up for a Gram...
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