Top 10 Most Extreme Music Genres

Arch Enemy. All I gotta say for the lead vocalist, the solos, the drums, the speed and just the sheer fact that there are two women who can sound like they have balls that have dropped below their knee caps will make me accept how Death Metal is the most extreme genre of music.
I don't know why but I get goosebumps only by hearing its name. I'm happy with only Thrash Metal. Other forms of Metal are a completely no-no!
The tempo changes, deep growls, heavily distorted low-tuned guitars and it's fastest genre in the world.
Deals Death - Fortified
Melodic death metal.
One of the extreme songs I know

Still I don't get why people say that death is more extreme. Did cannibal corpse impale goats and pig heads during their concerts? Bestial black metal (which is actually different from blackened death) is way more extreme than brutal death metal. Even some normal black metal bands are heavier than cannibal corpse (marduk, deathcrush mayhem, dark funeral, infernal war etc...)
Very extreme, especially Mayhem, Darkthrone and Immortal songs.
Depending on which bands you listen to
Only those who perfect the Norway and Swedish Black Metal can only know how kvlt this music was.
Hail Satan -|-
Death metal + heavy metal + hardcore=heavy

This is more of a punk subgenre than a metal subgenre, and it's one of the heaviest genres out there.
Some punk genres are actually more heavier than some metal genres because of how raw and chaotic punk is (I of course am talking about the more hardcore stuff and not the melodic/poppy sounding stuff). So punk is ironically more heavy than heavy metal.
The most extreme genre I've ever heard in metal subgenre.
Grindcore is violence.
This is the most extreme genre which can be at least considered as music, or it's subgenre - goregrind because of the low tuned guitar, often blast beat drumming and, of course, harsh, sick and bizzare vocal

This is the most hardcore, and why is hard rock higher than this? Someone clearly is retarded to think that.
Kreator, Sodom and Slayer are the examples.
The Newcomers
What is this?
Anime!
should be number 1
Really love this but it is REALLY extreme
Many mathcore bands like Messhugah,Dillinger Escape Plan and Protest The Hero are really heavy

Foo Fighters and System Of A Down are the most extreme examples of this genre.
The fastest genre in the world. A sub-genre of speedcore. BPM ia always 1000+. Many people say that it doesn't sound like music, because the tempo is so fast that it sounds like a single tone, thus the name: extratone.
How is this not number one
Diabarha, Hynla, Awesa just a name a few
Black metal, death metal, thrash metal... it's all baby music compared to extratone.
Evanescence, not only this band is Dark Metal but also is heavier than alll Gothic Metal bands, remember that heaviness is different with violence, also they make their guitar sounds heavier, just like Doom Metal bands, meanwhile, they're extreme.
This genre is extreme and symphonic. With death- and doom metal roots, there's no way this can't be #1
Slipknot, Linin Park, fast, violent mixed with death growls and groove metal thick voice, these things are enough to describe how much extreme this genre is.
Listen to Strapping Young Lad and come back here.