I'm not going to revert your last edits; however, there are some things that I want to point out:
 It doesn't matter whether this band is an "extraordinary case" or not. These need still a source and Rate My Music (and similar user-operated websites) have zero validity as a source. What you are doing now is adding genres according to your original research and your point is mostly based on this. Also whether another band page has sourced genres or not is not relevant; this must be necessary, especially for this sort of controversial articles.
 If you have any objections against the guideline, then you may open a discussion on the talk pages. However, you are currently doing whatever you desire and disregard every set of rule. I understand that you're doing this for the article's good and indeed the rules can be breakable if necessary. However, I am really baffled at your persistence on keeping the genres without any discussion or consensus, even after this amount of controversy it has generated. 
 I don't really think having around 65 genres on the infobox (without any sort of necessary prose or explanation in the article body) would be useful at all, especially for the readers.
 And yes, you are right. You are definitely editing the page with a fan's perspective.