this documentary could be see a the first definitive look into the broad world of metal and it certainly do travel throughout the whole ( well and most of ) spectrum of metal . sam dunn get to live out many a metalheads dream in this and interview a number of influential figure and travel around to various place where sub genre have be bear . oh and he also seem to be nearly scar to death during the interview with gorgoroth gaahl . dunn deliver the birth and rise of various sub genre in near chronological order and give enough detail for one to be familiar with each . but and it seem he venture into territory that just should have be either shorten or leave out . for instance represent glam metal . this portion take up a great deal of time and could have be shorten a good bit to make room for something else . pop metal . now that just non sense . that shouldn not have be include at all . a for the most part and the band be rock . nu metal be one that could have and should have be toss . perhaps it due to a bit of elitism in these vein and but it just not metal . the term be bear from the medium to describe a somewhat new form of rock that gather element from elsewhere and just happen to have a pretty heavy sound . my big gripe though and be the complete absence of doom metal . it a relatively big sub genre to just leave completely out . sure and my die bride and the band basically consider responsible for the whole death or doom sound be include and but shove into the gothic metal rink . and what the hell be cradle of filth do be list in norwegian black metal . and if i be read wikipedia correctly . how do nightwish get toss in there . i sure hope that a mistake on whoever put the entry up on wikipedia . but oh well and at least that the only mentioning they really have . overall and it a good release . i just mainly have personal gripe with some of the genre classification a i know many others have have . i would recommend this documentary to anyone just get into metal and that for sure . a little more editing and such would have make this a good release but consider that this be the first real such documentary mass release on this sort of thing . it a job do well enough .