Little Simz put on a masterclass on how live hip-hop ought to be approached today. Charli XCX confirmed what had felt inevitable in the lead-up to Lollapalooza. They no longer feel like a cult phenomenon that accidentally reached bigger stages; they are now, without question, an essential must-watch live band. Closing the festival without resorting to bombast, their restrained poise gently lowered the curtain on four demanding and exhilarating days. After the mud, rain and endless movement between stages, it was exactly the ending Lollapalooza deserved.