Hook, Line and Sinker!!!!

[Hguols]

If you're familiar with scales, sequencing music is all math as well. ‎  Both 3D graphics and music require a design factor, and apart from one dealing with angles and the other dealing with pitches, they're quite similar. ‎ 

Hguols is NOT "unblack" metal. ‎  I believe that genre term is a ridiculous concept. ‎  The term is coined from Horde's album "Hellig Usvart" (Norwegian for "Holy Unblack")
Basically some Christians started calling it "unblack metal" because they feel there is really no such thing as Christian black metal, since black metal is prominently satanic / anti-christian / etc.

The only difference between "unblack" and "black" is the lyrics.

With that logic blues music with happy lyrics would be "unblues" - ridiculous. ‎ 
That's my rant though.
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As far as the black metal music in general, there is definitely a prominent "noise" factor, and an "atmosphere" factor. ‎ 
Some bands sound like distorted flamenco music with a symphony in the background.

Others sound like really crusty punk with dark melodies and an aggressive percussion section.

Either way, this genre of music scratches my itch better than any other style.
Death metal and classical/ambient are a close 2nd. ‎  (a few exceptions, but some black metal is a marriage between the two)