Charli xcx joined The Strokes onstage during Outside Lands in San Francisco to perform a classic from the band's album "Is This It." Both acts headlined the festival, which ran the weekend of Aug. 7-8.
Charli xcx's own set was one of the festival's best moments, according to Rolling Stone, which described it as "scuzzy." She also appeared in backstage interviews alongside performers Jade and PinkPantheress as part of Billboard's All Access coverage of the event.
Other standout performances highlighted by Rolling Stone included a "raucous" set by Turnstile and an "arresting" performance by the xx. The festival brought together a diverse range of acts, with the headliners drawing particular attention.