Oh "Metal"... it is important if the band plays Black/Death Metal or Death/Black Metal... also there is a difference between Progressive Doom Metal or Progressive/Doom Metal, hahaha... I write a seperate "Metal hierarchy list", based on my library and metal archives.
They suggest the subgenres:
Black | Death | Doom/Stoner/Sludge | Electronic/Industrial | Experimental/Avant-garde | Folk/Viking/Pagan
Gothic | Grindcore | Groove | Heavy | Metalcore/Deathcore | Power | Progressive | Speed | Symphonic | Thrash
And it seems fine. I use mp3tag with metal-archives plugin for tagging, so I got hundreds of sub-sub genres, which I can't handle with genre categories - but now. Awesome
I am a bit hesitant to add such additional category levels for Metal.
Most Metal music of any subgenre has overlaps with other subgenres.
That often doesn't have to be a big problem, but for a hierarchy sheet like this, a subgenre can only go into one category.
Looking at the suggested categories above, where would these go?:
Industrial black metal
Industrial death metal
Industrial groove metal
Symphonic black metal
Symphonic death metal
I am guessing the first three go in 'Industrial', and the other three in 'Symphonic'?
What about these three:
Melodic black metal
Melodic death metal
Melodic groove metal
There is no 'Melodic' category, so they should probably go separately in: Black, Death and Groove?
Now if this is true, the result will be that when you select the category 'Black metal', you will not see the Industrial and the Symphonic versions, only the Melodic one.
Some other difficult ones (for me at least):
Does it go in the 'Symphonic' category or in the Metalcore/Deathcore category?
Or: 'Blackened death metal'.
I believe that's a fusion genre of Black metal and Death metal.
It can't go in both categories, and since it's a fusion of the two, it also can't go in one of them.
So in what category should it go?
In many cases metal subgenres seem to be about differences in either styles, lyrical content, tempo, atmosphere, etc.
To me that makes it difficult to define clean-cut sub-categories that will suit the general user, and will actually improve browsing instead of complicating it.
Maybe it is the 16 categories as suggested being a bit too many for this purpose?
Perhaps a smaller amount could work, I am not sure.