This one represents a small struggle for me.
I know that De Mysteriis Dom Satanas is not an excellent album in theoretical terms, nor is it even that far from the heavy metal that inspired it, but I find in this there is something undefinable.
Black people might call it soul, but I call it feeling: how hundreds of details of rhythm, tone and structure (phrase change within song) add up to a coherent whole, like a language unto itself.
The feeling to this album is incomparable. It exists nowhere else except maybe in the music of Ludwig van Beethoven, but without the apocalyptic urgency of distortion and pummeling arhythmic drums.
I cannot say this CD is heavy metal. I cannot say it is rock. It is something else. It aims to be something else. It does not want to join the crowd.
Yet on the other hand, my rational mind tells me that feeling is a logical thing, a summation of those same hundreds of details into a single symbol or expression of truth. When you love a girl, you are finding an equal, a breeding partner, a friend, someone to respect and so idealize.
So feeling might be rational, but not linear in the sense that writing computer programs or solving mathematical problems are. It is more like a geometry in which two or more convergent tendencies can exist as once, an expression not of "a balance" but of the many degrees of that balance.
Either way, incomparable is this feeling, and so this album.