Watch U2 Play 'Gloria' for First Time In 10 Years at Chicago Show

Bono also drapes himself in rainbow flag to celebrate Supreme Court's marriage equality decision

U2 played the third show of their five-night run at Chicago's United Center Sunday night, and for the second song of the evening, they dug out "Gloria" from their 1981 LP October. "We're a band from the north side of Dublin called U2," Bono told the crowd. "This is the first time we've played this song in about 20 years." (They actually played the tune more than a few times on the 2005 Vertigo tour.)

Prior to the show, the group soundchecked 1983's "Two Hearts Beat As One," which they haven't played since the Lovetown tour in 1989. It didn't make the show, but Bono did sprinkle a few lines from it into "Beautiful Day." The Edge worked on the guitar parts for "The Crystal Ballroom" from the expanded edition of Songs of Innocence prior to the show as well.

This was U2's first show since the landmark Supreme Court decision on Friday that granted marriage equality to all Americans, and Bono celebrated by wearing a rainbow flag during "Pride (In The Name of Love)." The singer also modified the lyrics of "Beautiful Day. "See the world in green and blue," he sang, via @U2. "A rainbow of colors right in front of you."

U2's Songs of Innocence + Experience Tour continues with two more Chicago shows this week, heading over to Toronto and Boston before wrapping up the American leg with an eight-night stand at New York's Madison Square Garden. The band will then head to Europe for the remainder of the year.