Top 10 Most Extreme Music Genres

Death Metal

Death metal is a subgenre of heavy metal music that emerged in the mid- to late-1980s. It is known for its aggressive drumming, distorted guitars, and growling vocals. The genre often explores dark and macabre themes in its lyrics.

Arch Enemy. All I have to say about 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 complete no-no for me!

The tempo changes, deep growls, heavily distorted low-tuned guitars, and its sheer speed make it the fastest genre in the world.

Black Metal

Black metal is a subgenre of heavy metal music that began in the early 1980s. It is characterized by fast tempos, shrieking vocals, and raw recording quality. The second wave of black metal, which originated in Norway, gained international attention for both its music and controversies.

Black Metal is still the most extreme genre of music that I can find, including all of its related subgenres and microgenres.
When I take a look at extreme EDM, for example, I find Breakcore. And while Breakcore is an extreme genre of music, Black Metal easily defeats Breakcore in musical extremity.
The only thing that could come close to beating Black Metal is perhaps some sort of hybrid between harsh black noise and war metal. Another genre that comes pretty close is Raw Hardstyle, which is an extreme underground EDM genre. It's very good, and I totally recommend it.
But yes, Black Metal tops in extremeness.

Still, I don't get why people say that death metal 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.).

Grindcore

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 heavier than some metal genres because of how raw and chaotic punk is. I am, of course, talking about the more hardcore stuff and not the melodic/poppy sounding stuff. So, punk is ironically heavier than heavy metal.

This is the most extreme genre that can at least still be considered music, or its subgenre - goregrind - because of the low-tuned guitar, frequent blast beat drumming, and, of course, harsh, sick, and bizarre vocals.

Goregrind

Deathcore

It depends on the bands a lot, but those like Infant Annihilator, Job For A Cowboy, Slaughter to Prevail, and Vulvodynia show how it is done. P.S. Bring Me The Horizon used to make the same type of music.

Harsh Noise

Thrash Metal

Thrash metal is a subgenre of heavy metal that emerged in the early 1980s and served as an early precursor to extreme metal. It is known for its fast and aggressive guitar work, shredding solos, and use of double-bass drumming. Vocals in thrash metal can range from melodic singing to intense shouting.... read more

Kreator, Sodom, and Slayer are the examples.

Power Electronics

The ugliest, loudest, scariest, most misanthropic, and dissonant music so brutal, it's not music, it's harsh hell sounds. The ultimate in terror. Why is this not number 1?

This is a very extreme genre. It features very distorted noise, extremely vulgar lyrics, and really loud sounds.

Mathcore

Technical Death Metal (Tech-Death or Progressive Death Metal)

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Brutal Death Metal

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Screamo

Hardcore

Hardcore punk is a subgenre of punk rock that originated in the late 1970s in North America and the United Kingdom. It is characterized by its fast tempos, aggressive style, and socially conscious lyrics. The genre also gave rise to a strong DIY ethic and an influential subculture.

Extratone

The fastest genre in the world. A sub-genre of speedcore. BPM is 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.

Hard Rock

Hard rock is a subgenre of rock music known for its heavier guitar riffs and solos. It originated around 1964-1965 with various garage rock bands and evolved further in the late 1960s and 1970s with artists like Led Zeppelin, Deep Purple, and AC/DC. The genre played a significant role in the development... read more

18? Seriously? It should be top 3! The guitar riffs are the definition of extreme. The voices are extreme too.

Foo Fighters and System Of A Down are the most extreme examples of this genre.

Groove Metal

Groove metal is a subgenre of heavy metal music that originated in the early 1990s. It is characterized by mid-tempo rhythms, heavy riffs, and a focus on groove and rhythm rather than speed. Bands such as Pantera, Sepultura, and Machine Head were instrumental in developing and popularizing the genre... read more

Avant-garde Metal

Industrial Metal

Listen to Strapping Young Lad and come back here.

Powerviolence

Metalcore

Speedcore

Definitely deserves top of the list. Starting at 700bpm, there is nothing more aggressive than that.

Gorenoise

Nu-Metal

Slipknot, Linkin Park, fast, violent, mixed with death growls and groove metal thick voice, these things are enough to describe how extreme this genre is.

Hardcore Techno

Also known as gabber, this is THE most extreme genre, and the only reason it isn't on top is that the exposure of this genre is much less compared to the ones in the top 10.
The most extreme subgenres of hardcore are terrorcore, speedcore, and extratone, which range from massive bass-backed kicks from 200 BPM to 300 BPM, coupled with aggressive, sometimes satanic, vocals for the first two. Personally, extratone is beyond me. It's too extreme.
Here are some examples: Tripped - Pure Hate (300 BPM), Noisekick - Just Statin (260 BPM), Drokz - This Ain't No Disco (probably 200 BPM). The kicks and basses in these tracks shatter walls, lads.