Picture Bonnaroo. Now add more people, more drinking, a flurry of European soccer (ahem, football) chants and a heavily relaxed attitude toward standard (U.S.) societal mores. Welcome to Roskilde, one of the biggest music festivals in the world located 20 miles west of Copenhagen, Denmark. What started as a hippie retreat by two high school students in 1971 has turned into a mecca for Europeans, drawing more than 125,000 people, including 30,000 volunteers. This year, Bruce Springsteen, Jack White, the Cure, Bjork, Bon Iver and Mew headlined the four-day fest, featuring 200 acts from 36 different countries. The sheer volume of music can be overwhelming, but we've distilled the four wild, action-packed days down to the 10 best moments.