Jacob Ehrbahn’s Headbangers: A close-up look at headbangers around Europe (PHOTOS).

A few years ago, Jacob Ehrbahn, a staff photographer at the Danish national newspaper Politiken, found himself captivated by a heavy metal festival called Copenhell. The three-day self-assignment began a project that would eventually become a book, Headbangers, which will be published in the United States by PowerHouse next month.