Sound Debate If Machine Head are to be classed by a certain sub genre of metal two things really need to happen 1 There has to be a rationale for the classification in the Sound Debate sub section They ve been considered for about 10 different metal genres at different times so this can t be stressed enough 2 If there is to be a rationale some form of substantiation would most definitely help Either a recognised critical opinion or perhaps even the band s own thoughts Encyclopaedia s aren t meant to reflect one person s particular opinion