"Metal is expanding and becoming more diverse. It's becoming global and it's becoming a tool for social and political commentary."
These words were spoken by anthropologist and filmmaker Sam Dunn in a report by MSNBC. Dunn directed Metal: A Headbanger's Journey, a 2005 documentary that studied the cultural aspects of metal, as well as opinions on it and the supposed controversy surrounding the music genre. The film debuted at the 2005 Toronto Film Festival.