Charli xcx joined The Strokes onstage at Outside Lands in San Francisco Saturday to perform “Take It or Leave It.” Get The Strokes Tickets HereThe guest spot played on the fact that The Strokes and Charli xcx released albums on the same day in July. Get Charli xcx Tickets HereRelated VideoOn July 24th, Charli xcx released Music, Fashion, Film and The Strokes put out Reality Awaits. The day before her cameo with The Strokes, Charli xcx headlined the first night of Outside Lands. After the duet rendition of “Take It or Leave It,” Casablancas told the crowd Charli xcx won the record sales battle.