View the original article at: http://www.countryweekly.com/news/taylor-swift-sings-rolling-stones
Turnabout is fair play.
Taylor Swift has had tons of major pop stars—including James Taylor, Justin Bieber and Jason Mraz—as surprise guests during her concerts.
Monday night (June 3), Taylor was the surprise guest for The Rolling Stones’ concert in Chicago. She and lead singer Mick Jagger did a stripped-down duet  of the ballad “As Tears Go By,” a performance that even included a little dancing from the two superstars (video below).
Taylor was elated about the whole experience, Tweeting afterward,
June 4, 2013 
Mick and Keith and the boys are definitely showing country artists the love on this tour. On Friday night (May 31), country crossover artist Sheryl Crow joined the Stones onstage  for their first Chicago concert. And Carrie Underwood and Keith Urban have played with the legendary rockers at shows earlier in the tour.