Genre   Heavy Metal simply isnt enough to describe early Black Sabbath According to this they originally formed as a bluesrock band and according to this VH calls them Hard Rock I think thats more than enough evidence that either bluesrock or hark rock need to be added to the genre section      I assume that you want to add to the infobox because these other genressubgenres are mentioned in the article This comes up frequently on this page and the problem is that bands with long histories can be categorized under many different heading in this case the ones you mentioned plus doom metal stoner rock gothic metal and others are often brought up To keep things under control it has been decided that it would say Heavy Metal in the infobox because there are the most sources calling them that and Rock in the opening sentence because all of the other genres are subgenres of Rock The Formation and early days  section of the article talks of their blues origins and other stylesgenres are described in the Musical style Legacy and Influence and innovation sections of the article