(Photo by Mike Coppola/Getty Images for DirecTV)

Dave Matthews has announced a benefit concert later this month to support the Standing Rock Sioux Tribe’s ongoing protest against the Dakota Access Pipeline.

Matthews will be joined by “more artists to be announced soon” on November 27 at DAR Constitution Hall. Net proceeds will help provide supplies and legal assistance to the protesters, who identify themselves as water protectors.

The pipeline has made national headlines—which multiplied after folks on Facebook began checking in to the country’s sixth-largest reservation—as the clash intensifies between police and Native Americans and their allies.

The Standing Rock Sioux Tribe considers the area sacred land, and they are worried about the pipeline’s effect on the Missouri River and its tributaries.

“How can we continue to allow oil money to dictate our environmental and social policies? The people of Standing Rock, and those who are supporting them, are standing up for their children and all of our children,” Matthews said in a statement. “We are letting the Dakota pipeline silence their voices. Not only are they desecrating sacred lands, but they also threaten to poison the Missouri River.”

He recently visited students at Standing Rock Elementary as part of the Turnaround Arts, and apparently also visited the encampment, performing “Don’t Drink The Water.”