Last night (Oct. 29) marked the halfway point of U2’s six-night residency at the O2 Arena in London, and as a special treat for the audience, the Irish rockers brought out Patti Smith for a powerful performance of her 1988 song, “People Have the Power.”

As Rolling Stone reports, Bono and company alluded to Smith’s forthcoming appearance when they covered a snippet of Them’s “Gloria,” which Smith reworked for 1975’s Horses. U2 circled back to the song as Smith appeared on stage and joined Bono on vocals.

“To take us home, as she took us here, let’s see if we can do something very special,” Bono told the crowd, as Smith and the band transitioned to “People Have the Power.” Check out the full performance in the video at the top.

Afterward, Bono commented, “We wouldn’t be in this band without Patti Smith.”

U2 wrap up their run at the O2 on Nov. 3. Then, they head to Glasgow, Paris and Belfast before concluding their Innocence + Experience tour with a four-night run in Dublin from Nov. 23-28.