Top 10 Theoretical Genres of Rock and Metal

These are genres that could be an awesome genre of rock. Disclaimer, I'm not saying that these could happen, I'm just saying that it would be nice to see songs in these theoretical genres of Rock or Metal.
The Top Ten
1 Symphonic Thrash Metal

This would be my #1 - Metallica actually did it in the S&M live album (the live concert with SF Symphony). I think it was awesome. So it's proven it works but for some reason metal bands don't use this idea to record new songs in the studio. The reason is probably that it takes much more efforts to work with full symphonic orchestras - I've read interviews with Blind Guardian about this and I have to tell you: not many would invest so much extra efforts to please the fans.

2 Power Thrash Metal

I agree with this and I think speed metal is very close to this idea. Thrash = speed/power metal + hardcore punk. For this reason power metal and thrash are compatible so it's possible. James Hetfield even used to call Metallica genre "power metal" when the term "thrash" didn't exist.
Try this song: Iced Earth - Dante's Inferno (epic thrashy song with great clean vocals; they have more songs of this type).
Also a big share of Blind Guardian discography is exactly this - thrashy power metal and speed metal.

Power Metal + Thrash Metal = This Epic genre of music

3 Heavy Rock

I definitely agree with this and with the examples of the author of this list - a term like "Heavy Rock" would solve many problems when trying to define the genre of some bands/songs.
I would put many Whitesnake songs under this umbrella "Heavy Rock".

4 Power Djent

Maybe typical power metal and djent wouldn't work well or easy. But some Blind Guardian songs probably would work because they have heavier or more progressive songs. Also, unlike other power metal singers, Hansi voice: 1) isn't high-pitched; 2) his voice is significantly more aggressive than the average in power metal; 3) among the power metal singers he uses voice distortion the most and this would go well with the djent distortion.

For example their song 'Tanelorn (Into The Void)' - riffs are already pretty brutal and I somehow succeeded to imagine these riffs on djent guitars. And very conveniently, Andre solo is jazzy at times - so djenty!

Now I guess I only have to buy djent guitars for Andre and Marcus, haha.

CjWriter1997, I think it will sound...djenty, haha. This idea is interesting - I like djent and power metal (if "power" means power metal here). OK, I would like to hear this, too.
Right now I'm trying to picture Meshuggah version of Gamma Ray and Helloween discography. Hmm, djent is too low-pitched and with too much distortion for power metal. But I'll keep on trying, haha.

I'm just curious how it will sound.

5 Hard Blues Rock

There is a pretty similar genre to this genre. It's "heavy blues". Led Zeppelin, Blue Cheer, Vanilla Fudge etc bands. It was originally created for creating heavy metal. But later, it is now classified as hard rock. or heavy blues more accurately.

This really should be a genre Hard Rock but with more Blues influence the Pioneers of this genre would be AC/DC and George Thorogood

6 Stoner Groove

Agree, this would work. But maybe it's not gonna be metal anymore.

7 Groove Grunge
8 Power Groove Metal

In The End by Anthrax is a Perfect Example of how this could work also Imagine seeing Dimebag Darrell and Ronnie James Dio (I know he's not Power Metal but he can sing Power Metal songs) preform on stage who wouldn't want to see that

9 Southern Groove Metal
10 Technical Groove Metal

I am very sceptical about this to be honest. 'Technical' usually means faster, more complex or/and more progressive than the average in the (sub)genre. Groove Metal is far from this - I would say, it's the opposite. It's not fast, not complex and not progressive.

This would be an awesome genre of music Groove Metal but with technicality and this would probably be my favorite genre of music

The Contenders
11 Extreme Thrash Metal

Examples Slayer and Kreator would fit this genre perfectly as its Thrash Metal but more extreme than regular Thrash Metal basically this would be the barrier between Thrash Metal and Death Metal

12 Progressive Doom Metal
13 Death Groove

Basically Groove Metal but with more Death Metal Influences added in

14 Garage Thrash Metal

As much if you don't like St. Angers Production it would be nice to see a genre based on St. Angers sound just remove the Snare Drum and some of the Nu Metalish influences and you would have Garage Thrash Metal another name for this genre would be

St. Anger Thrash Metal

15 Symphonic Nu Metal
16 Industrial Doom Metal
17 Nu Glam Metal
18 Surf Metal
19 Country Metal
20 Soul Rock
21 Folk Djent
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