How has Bonnaroo changed over the years? We asked someone with a rare vantage point — Elizabeth Thorpe, festival photographer and our West Coast correspondent, who's been going to Bonnaroo since 2004 and now shoots it from inside the photo pit. Beth walks us through what the festival experience is really like from behind the lens: the "first three songs only" rule, why the pit is her happy place, and how Bonnaroo has evolved from a freewheeling field party into something bigger, busier, and more produced.