war metal is a style like swedish death metal is a style. Fairly developed sound with variations on a theme but still part of the larger black metal picture for sure.

Is there really such a thing as Funeral Black Metal? I bring this up because the band قفص is listed here as "Funeral Black/Doom Metal", which I found to be very peculiar. I guess this is more or less a rhetorical question, but if anyone has a good answer for this, let me know.

Not that I know of. "black" and "doom" probably got switched around there.

There is definitely a difference. When I think of industrial I think of really dark experimental/electronic music like Throbbing Gristle, Premature Ejaculation, early Einstürzende Neubauten or Nurse With Wound. EBM on the other hand I see as electronic music à la poppier Kraftwerk with some industrial, like Die Krupps, Front 242 or Bigod 20. That's how I see it anyway, don't take my word for it

Well, I saw that the tag "post-thrash" was removed because it is often mistaken by groove metal, but I actually believe that it is a different genre. Probably not much relevant, but still classifies as something real. For example, bands like House of Thumbs, Machine Head and Invocator/Forbidden at some points could be refered as post-thrash, but now that the tag was removed, I find a little difficult to find anything more, specially for my blog about heavy metal music, in which I would like to refer more than 4 bands. There is any other band that sounds like those or that could be classified as "post-thrash" of your knowledge?

Is there really a difference between stoner/doom and psychedelic doom metal?

Stoner/doom is basically a mix between the elements of stoner metal and doom metal. Check those songs:
http://www.youtube.com/watch?v=4fCM9Chyt34
http://www.youtube.com/watch?v=TYT7NVWpY_g

and psychedelic doom is doom metal with psychedelic rock elements, which are also proportioned to the heavy metal aesthetics. Acid Witch, for example, is a psychedelic death doom band:
http://www.youtube.com/watch?v=vE7iQs23y6I
For this, you can also imagine a fusion between Jefferson Airplane and Solitude Aeturnus.

Funeral black: Mostly a syntax thing with funeral doom + black metal. I've seen the first I Shalt Become album called "funeral black metal" and it seems like an illustrious descriptor.

Post-thrash: This was kind of a lousy term in the first place. It seems like you're describing thrash-turned-groove bands. I've found that genre listed on all sorts of melodeath, metalcore, groove metal, and even some mallcore.

Stoner/psych: I know this is a shitty description, but I tend to think of stoner bands as droning on with their fuzzy amp tone, while psychedelic bands drone on their effects pedals. There's a fair amount of overlap, especially in recent stuff. MDL describes it better than I can.

what about that kawai metal trash?

I don't even consider it as a real genre, but apparently is just heavy metal with j-pop elements and aesthetics. Technically, you can refer to it as some type of nu metal.

Is "Crossover Metal" a Thing? Metal with other non-rock genres (Metal and Reggae, Metal and Funk, Metal and Jazz)

When "crossover" is listed on this site, it refers to the hardcore punk-thrash/speed metal hybrid. Examples are DRI, Cryptic Slaughter, and MOD

For those fusioned genres, you have, respectively, Skindred (nu metal), Mordred/Mind Funk/24-7 Spyz (funk metal) and lots of technical, progressive and avant-garde metal bands. Diablo Swing Orchestra and Fleurety use, sometimes, jazz instruments on their music. Defeated Sanity, Atheist and Pestilence are most likely to use its musical structure and rhythm.
The only legitimate crossover metal that exists is the thrash metal influenced by hardcore/punk, coming from bands like DRI, SOD and Lethal Aggression.

I have one more. Does white metal actually exist?

"White metal" is used as a synonym for "unblack metal", which is actually Christian-themed black metal. Therefore, "white metal" is only a lyrical descriptor and not a genre itself.

White metal is also used by some as a catch-all for all christian themed metal. Like how black metal used to be used to refer to any metal with occult and/or satanic lyrics before it became its own genre.

what distinguishes blackened death metal from war metal?

Is "melodic heavy metal" a real thing? I noticed there are many bands here in metal archives with this genre and it sounds a little redundant to me since heavy metal in general is fairly melodic. I like Bellicose's Love on ice for example but it doesn't sound particularly melodic in comparison to other bands, so now I'm curious about it.

blackened death metal is death metal with black metal elements and similar sonorous musicianship, such as this: http://www.youtube.com/watch?v=SOTso_fXHUE

war metal is like a mix between death and black metal in a grindcore-aesthetic twist, making it to sound very raw, obscure and fast, at the same time. Bands like Blasphemy, ZOM, Archgoat and Sarcófago fall under this genre: http://www.youtube.com/watch?v=W-MkRc0ObAo

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melodic heavy metal can be something with much more melodic riffing than regular heavy metal. For example, bands such as Remnant or Wolf would not be really acessible to some people by being harsh-sounding. However, melodic heavy metal is pretty more acessible and often confused with hard rock. It can also take a touch of keyboards or pianos, as generally, in some bands such as Beltane or Atra Vetosus, which are black metal bands with key/synth twist, making it to sound more melodic.
Check this example of melodic heavy metal, still haves the aesthetics of regular metal music, but very less harsh sounding: http://www.youtube.com/watch?v=VDTBhKquag4

I don't know if it's a terribly common style, but there is such a thing as funeral doom combined with black metal. Nortt is an example.

Could someone explain me a bit of crust/sludge? I often see them togheter, sometimes with the "post- " tag too. I'm recently trying to explore these genres, but this mix confuses me a bit

Crust punk + sludge metal?!

Well, since sludge metal is inspired also by hardcore, maybe there are some bands that make it to sound pretty crust-y. Those vertents are very relationed with each other, you can even hear sludge influences or parts on hardcore styles, like crust or powerviolence.
Post-metal is, practically, an atmospheric version of sludge without the primary doom influences, getting the aesthetics of post-rock or post-hardcore. It is also known by escaping from the heavy metal general convenctions.
If you want to understand a genre by yourself, you shall listen to bands that play one that certain genre, without any other mixtures, until you get how does it sounds like. A quick search on MA is enough.

Crust/sludge is shit like Dystopia (which I recommend, a lot).

Can anyone explain me what is adult contemporary? There are lots of descriptions about it, but they don't sound very consistent, but vague and superfluous.

It's a soft rock radio format. Nothing more and nothing less.

crust specifically the form of stenchcore has been a major influence on sludge since the early days. Neurosis themselves still have riffs today that could fit on an amebix or axegrinder record.

What is caverncore?

Portal and Grave Upheaval copycats.

I wouldn't exactly say it's limited to that sort of thing. That's just the gonzo end of it. Basically it's a catch-all for this ultra dark, vaguely blackened but also vaguely (or even overtly) old-school sounding death metal that puts a heavy emphasis on Incantation-ish juxtapositions of violent assaults and trudging bits, usually with super low-tuned guitars, deep vocals and lots of reverb everywhere. Some bands are more experimental while others are a lot more straightforward.

So caverncore is the death metal version of orthodox black metal?

No? Maybe there are some vague similarities but orthodox black metal tends to be mostly centered on the chaotic riffing and deadpan serious theistic satanism.

I never understood why the "post-" component in all those new genre names is equivalent to slowing everything down and blurring everything up.

Apart from post-thrash (i.e. groove metal), most genres with "post-" in the name indicate a post-rock influence. Post-rock has come to be a very well-defined genre in its own right and places heavy focus on slow-moving, gradual build-ups.

Where do you guys draw the line between death/doom and gothic metal??

Take Paradise Lost for an example, their debut Lost Paradise I'd call death/doom, and Draconian Times would be gothic metal, but what about the three albums between those?

Same applies for Turn Loose The Swans, Katatonia's debut and Brave Murder Day, Anathema's Silent Enigma, most of Swallow The Sun's discography, Draconian, etc... I often see those albums called death/doom, but I can't find many death metal elements in them besides the vocals (I do see the death metal in My Dying Bride's debut though, and bands like Asphyx, Disembowelment, etc...)

As far as doom is concerned: I can't listen to stuff like Orange Goblin or Cathedral but I very much dig Swallow The Sun, even if they have (or partly because of) gothic elements in their music. I don't know if it's doom or gothic doom metal, but it's far enough from both genres to please my ears. I wouldn't name them death metal in any case, though.

I wouldn't draw a line there, as there's a ton of overlap and influence between the styles, rarely clear-cut. For example, Katatonia's "Tomb of Insomnia" has some sections of new wave/post-punk/gothic rock type stuff, but I'd hardly call it gothic metal. Lots of stuff mixed together, not a good place to try to draw lines.

Bands like Xasthur or Austere may be described as funeral black metal, riffs and tempos are very much in the vein of Swedish and Norwegian BM, the overall atmosphere is very Burzum-like and probably even more gloomy than the gloomiest Burzum songs, hence the "funeral" component. Not exactly my mug of beer but probably some people love it. I'm not really convinced by this suicidal views, BM to me was always negative as far as the message is concerned but also positive in the meaning that while disregarding the world in general, black metal-minded person also celebrates his inner world. Suicidal or funeral black metal is an obvious divergence from this line of thought.

caverncore and orthodox black metal do have some overlap but the orthodox black metal bands tend to go for more dissonant melodies. Bands inbetween both are for example irkallian oracle.

I still have a doubt about Djent. I'm really not sure from what genre does it cames from. Some fonts say progressive/groove metal or nu metal or metalcore. I know that djent haves many branches on the heavy metal scene, but I can't find its actual origin.