this be a solid and interesting documentary which i would recommend to everybody who love metal but also to people who be not necessarily fan of the genre but have interest in music or underground culture . what make this documentary likable and catch the attention be that it combine solid knowledge and research with a personal style . the author declare himself a fan and visit club and festival and travel to get interview and add his personal touch to the whole story which make it likable and well document at the same time . sure and the fan of different genre and band may always have complaint to enter because their favorite flavor of metal or their specific band do not get enough screen time or even omit . i for example may have like to hear more full act of music and i be wonder why gothic rock do not get some coverage . yet and we find in the film both an historic thread that be well build and as well a a good coverage of specific subject and message like sex and death and violence and etc . that traverse the whole history and different style in a consistent manner . this documentary if both informational and entertaining .