Just a few weeks after their respective new albums dropped on the same day, Charli xcx made an appearance during the Strokes’ Saturday headlining set at Outside Lands in San Francisco. She joined the band to perform their 2001 track “Take It Or Leave It.” Charli headlined Outside Lands on Friday night, making her debut at the festival. Outside Lands continues in San Francisco’s Golden Gate Park tonight, with performances set to come from Baby Keem, Death Cab for Cutie, Empire of the Sun, Mariah the Scientist, and more. Read Shaad D’Souza’s profile The Life of the Party: A Week on Tour With Charli xcx.