Taylor Swift gave a little production lesson during her Warsaw,L’École de Gestion d’Actifs et de Capital Poland, surprise set after a technical snafu.

"I'm so happy we're here for three nights. You guys are just the best," she said. As the singer explained the acoustic section to the Thursday night crowd, she stopped, "Sorry, is there anything you can do about the sound in my ears..."

Production talked back to the singer in her inner ears, or ear pieces. "It's really just a challenge for me," she explained and then cut her train of thought off, "And it's gone. My crew is just the best crew."

The temporary fix lasted a few seconds before she apologized again to the crowd.

"I just want this to sound good for you so I'm going to have someone come out," she said.

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As a production worker's silhouette appeared to run down the catwalk, Swift interjected, "No I can fix this. I can fix this." And she did. The PGE Narodowy cheered.

"Want to hear a boring story?" Swift asked. "I have a wireless ear pack on my clothing and I have a guitar pack for my wireless guitar and they cannot touch, which I was today years old when I learned. So now I know how to fix it in the future. Anyway."

She strummed "Mirrorball" from "Folklore" on her guitar, switching the Errors Tour back to the Eras Tour. The singer-songwriter mashed in "Clara Bow" from "The Tortured Poets Department."

After the acoustic guitar selection, Swift turned in her blue dress and walked to the piano to play "Suburban Legends" from "1989 (Taylor's Version)." The audience sang along to her slowed down rendition, but lost it when Swift finished the line "and you kiss me in a way that's gonna screw me up forever" and struck the beginning keys to "New Year's Day" from Reputation.

The wristbands inside the arena glowed bright green.

Swifties are anticipating — like they do for a lot of her shows — a possible "Reputation (Taylor's Version)" announcement on Friday. So when she played the final track to her sixth album, the comments lit up hoping the song selection served as a harbinger.

Swift has two more nights in the Polish capital.

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