At a charity concert held in Charlottesville, Virginia, musician Pharrell Williams got down on both knees in an emotional tribute to the victims of violent clashes between the far-right and counter-protestors in the town last month.
"If I want to get on my knees right now for the people of my city, for the people of my state, that's what this flag is for," Williams, who hails from Virginia Beach, told a cheering crowd.
Backed by The Roots, he then launched into a rendition of his hit song "Happy."
US President Donald Trump has accused the athletes of "disrespecting" the American flag by refusing to stand when the anthem is played.
During the Charlottesville concert, singer Dave Matthews introduced Susan Bro, the mother of 32-year-old Heather Heyer, an anti-fascism activist who was killed during a protest against a gathering of far-right sympathizers in Charlottesville last month.
During the Charlottesville concert, singer Dave Matthews introduced Susan Bro, the mother of Heather Heyer, a 32-year-old paralegal who was killed in Charlottesville last month. Heyer had joined counter-protesters from organizations such as Black Lives Matter and was run down in a car during a protest against 'Unite the Right', a gathering of alt-right opponents to the destruction of statues commemorating Confederate Civil War figureheads.
"I'm here in her place to sing with all of you in her place," Bro told the crow, asking them to "turn our righteous anger into action and understanding."
"By raising our voices against hatred, you make Heather's death count … and her brief life mean even more," she said. "Sing your hearts out!"
Other performers at the concert included Justin Timberlake, Ariana Grande and Chris Stapleton, as well as surprise guest appearances by Chris Martin and Stevie Wonder.