 A year after Woodstock was held in the U.S., a British farmer decided to do something similar and invited rock stars to his family farm. That was southwest England in 1970. And now 54 years later, Glastonbury is one of the world's biggest music festivals. This weekend's lineup includes Dua Lipa, Coldplay, and Shania Twain. Even now, the five-day festival somehow manages to stick to its founder's motto of leave no trace on the land. NPR's Lauren Frayer takes a look at how.