Charli XCX performs at Outside Lands on Friday, Aug. 7, 2026 in San Francisco. Charli joined alt-rockers The Strokes during their Aug. 8 set for a performance of the band’s song “Take It Or Leave It.” Strokes member Julian Casablancas introduced her by saying, “We’ve got a special little guest; a big guest. He also noted that The Strokes’ new album came out the same day as Charli’s Music, Fashion, Film album, but her album outsold theirs. When he played it at the festival, though, Charli appeared on the screen, pretending to leave Djo a voicemail.