Article continues below advertisementJustin Bieber didn't just take the stage at Coachella, he reset the conversation around his career.Headlining the festival in Indio, California, the 32-year-old pop star delivered a performance that leaned heavily on nostalgia, swapping out Coachella's usual spectacle for a minimalist setup centered around a laptop and a YouTube homepage, from which he played early clips like his viral 2008 cover of "With You" and hits like "Baby.