In the 2010s, a teenage girl songwriter came out of nowhere to completely redefine cool for the decade, upend the pop landscape and inspire legions of imitators. Twice. But only one of them can reign, so which teen anthem of the decade overwhelms you more with its effortless above-it-all teenage-ness, "Royals" by Lorde or "bad guy" by Billie Eilish?

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