Sometimes it seems as if everyone wants to be a pop girlie. Last year, Taylor Swift counted herself among the “tortured poets,” but nowadays she is a self-described “showgirl,” having released a short album full of bite-size songs co-produced by the distinguished hitmakers Max Martin and Shellback. The year’s biggest new musical act is probably Huntr/x, the fictional girl group from the animated Netflix film “KPop Demon Hunters.” When Demi Lovato, the former Disney teen idol, wanted to go back to her roots, she released “Fast,” a perfectly superficial club track; the accompanying album is called, appropriately, “It’s Not That Deep.” Even MGK, the rapper turned rocker, tried to reinvent himself earlier this year with a video called “Cliché,” in which he danced and lip-synched like a boy-ban

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