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Taylor Swift sings Calvin Harris' 'This Is What You Came For' at her only concert of 2016

Singer-songwriter Taylor Swift performs her only full concert of 2016 during the Formula One United States Grand Prix at Circuit of the Americas on Oct. 22, 2016, in Austin, Texas.

Suzanne Cordeiro/Austin American-Statesman

AUSTIN, Texas — Taylor Swift, 26, took the stage at the Formula One U.S. Grand Prix race in Austin, Texas, on Saturday night to perform a song she's never sung in front of an audience.

Swift sang her version of "This Is What You Came For," which she co-wrote with ex-boyfriend Calvin Harris. Harris and Rihanna came together to sing the song this summer.

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“I’ve never played this song live before,” Swift, who was recovering from a cold, told her fans. “But if you know it, maybe you could sing along, and then I could get to know what that feels like to hear it sung back to me.”

It was her only concert of the year.