Taylor Swift teamed with Swedish hit whisperers Max Martin and Shellback on her new single, and its hooks, plural, have a zing that's more Stockholm than Nashville. But it's unmistakably Taylor: a witty relationship postmortem, delivered in inimitable girlie-girl patois. And this bit – ". . . I'm just, I mean, this is exhausting. Like, we are never getting back together. Like, ever" – might be the most sublime spoken-word interlude in pop since Barry White died.