One of the two stars above wrote and sang the lyrics squeezed between them. But which one was it? Mopey alt-rock god Morrissey or boy-troubled pop gazillionaire Taylor Swift?

This is a tough one. All that talk of skin and bone certainly points to the ex-Smiths singer, whose cynicism is legendary. But that going-with-the-flow attitude is definitely more Swiftian in its acceptance of fate and the way things are. But "friction" is all Moz, all the time.

Do you know who wrote those lyrics? Take a guess, and then click the button below to find out if you're right.

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