The Rolling Stones have always had a thing for country. So who better to invite onstage with them on their 50th anniversary tour than Taylor Swift?
The country superstar was the surprise guest of the legendary rockers' concert at Chicago's United Center Monday night, joining Mick Jagger for a touching duet of the Stones' timeless 1965 classic "As Tears Go By."
The ballad was one of the first songs the frontman and sidekick Keith Richards wrote together. It became a hit for British singer Marianne Faithfull in 1964 before the World's Greatest Rock and Roll Band scored with it the following year.