She also tells the crowd that all surprise guests 'do it for free.'

By Jessica Goodman
September 17, 2015 at 12:26 PM EDT
Michael Hickey/LP5/Getty Images

Taylor Swift’s tour is far from over, which means there are still artists to trot out on stage and perform their biggest hits of the season. In Indianapolis on Wednesday night, Swift brought out The Band Perry to sing “If I Die Young,” the 2010 smash single from the band’s self-titled album.

Before introducing the family band, Swift also addressed fans’ questions about how she chooses special guests to join her on tour. “I want to remind you that anyone you see on the 1989 world tour coming out to surprise an audience,” she said. “They’re doing it for free out of the goodness of their heart because they wanted to come and play for you and surprise you. Any guest artist that you see on the 1989 tour stage had the opportunity to surprise any crowd at any show and they chose you, Indy.”

See fan-shot footage of their performance and her comments:







Other guests on the 1989 tour have included Julia Roberts, who said she hopped on stage after meeting Swift at the meet-and-greet before the show, Wiz Khalifa, Rachel Platten, Avril Lavigne, Lisa Kudrow, Selena Gomez, Justin Timberlake, and countless performers. (Keep track with EW’s updated list.)

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