Bey or Tay?: Who’s the best pop star of the 21st century?

Billboard sparked an online feud between Swifties and the Beyhive after it announced Beyoncé as the top pop star of the 21st century. And, of course, that means Taylor Swift came in at #2. Is Beyoncé's spot on the list “Irreplaceable?” Or is the “Bad Blood” warranted? Abby Phillip and her Newsnight panelists discuss.

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