I don't have an e-library at the moment and it sucks, but I know some people who organize their music exactly how Allmusic does (they just copy the data from their site), which is by mood and most basic description of genre. So basically, all guitar based music including Slayer is "pop/rock", which some people don't like but the moods are what sets everything apart. Not sure how it was done exactly, but there's probably a decent service where you can add tags like the moods of each album or song, etc.
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