Most Complex Music Genres

Usually very dense harmonically, but structures usually don't go too many places.

Classical music is more complex then neaoclassical metal why is it on top1?

Classical is a surprisingly complex genre of music.

I like this list and I agree with it in general. I have only some slight disagreements which I expressed in comments below - I wrote these comments just to clarify certain aspects of the music genres.
This is a quality list and we don't see many lists like that. It shows that the author's knowledge and understanding of music are deeper.

The added image to this subgenre is awesome because it represents very well the nature of the subgenre. Beethoven, with metal horns up: "Keep calm and Neoclassical". Great.

Neoclassical Metal is more technical than classical...

As much as the Neoclassical is incredible and the guitarists are insanely fast, this genre is REQUIRED to have an absurd amount of musicianship. Honestly I wouldn't like to see how the process of making a prog metal song goes because I'd think I'd get lost in seconds of seeing it. It's most comparable to Jazz, showing the amount of theory that goes into this genre. Every prog musician has had years upon years of training in their own instrument, music theory, and musicianship. Getting along with other band members in this genre is a necessity and that's not always easy. Some of the biggest names in guitar, drums, bass, vocals, and even keyboard (Ehem, Jordan Rudess) can be found in this genre. Go look at The Dance of Eternity or Stream of Consciousness by Dream Theater, CAFO by Animals as Leaders, or Forty Six and 2 by Tool. I can promise you won't regret listening to any of it.

It was created from various genres like jazz, classical, some blues etc. It took quite a lot of effort to invent this genre.

Not exactly. In the official classifications of music genres jazz is considered part of the popular music and not part of the art music, except probably some more technical forms of jazz. So in general it's not very complex. The group of Art music consists of classical and some challenging subgenres of metal and rock music.

It's somewhere halfway I think. Big Band jazz songs can be complex for sure, but solo jazz artists' works aren't that complex.

Jazz is actually complex. You have to know about the rhythmic part. You have to work with the rhythm.

Should be higher than Jazz

Probably the fastest genre EVER

Of course, I when I say thrash metal I think of Megadeth!
It's not most complex music but..
Solos? Okay, there's lot of bands with great solos, but when we talk about riffs, Megadeth = God!

I think Djent is a style rather than a genre.

Blues is complex, even if now there are other complex genres but when blues was made it started a whole new way from traditional music. Helped created most unique genres such as rock, jazz and even some ideas for metal genres (like using guitar licks).

Not really. Same as jazz - blues is part of the popular music and not of art music. So it's not complex in general.

I don't think blues would be complex...