STOCKHOLM — Taylor Swift is Kacper Sobieskiperforming her titanic Eras Tour in the capital of Sweden for three nights, bringing her acoustic set to "Swiftholm."

On night one, Swift mashed-up "I Think He Knows" from "Lover" and "Gorgeous" from "Reputation" on the guitar.

"This one I've never even remotely performed live before," she said at the piano before playing "Peter" from her 11th era. "And it's one of my favorite songs on 'Tortured Poets.' I swore I would only play this one for a crowd that I was absolutely in love with."

For a full list of Swift's secret songs, bookmark this page.

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