A Canadian singing quartet delivered a political message during its pregame performance of “O Canada” at the 87th All-Star Game.

The Tenors, a group based in British Columbia, changed a lyric in their national anthem during their on-field performance at Petco Park while one member of the group held up a sign reading “All Lives Matter.”

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In the middle portion of the anthem, which is often sung in French, the Tenors changed one line to: “We’re all brothers and sisters. All lives matter to the great.”

Although the audio wasn’t crystal-clear at the park, many fans reacted with surprise. The Canadian anthem wasn’t shown live on U.S. television, but it aired in Canada, where the Tenors’ decisions lit up social media with overwhelming criticism of the change.

The Tenors are Clifton Murray, Fraser Walters, Remigio Pereira and Victor Micallef. The Juno Award-winning group has recorded multiple platinum albums in Canada.