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Houses Ov Mercury
Now, I do not understand "technical X metal" being a genre. DOesn't that just mean it is X genre, but hard to play? In which case, it would belong in X genre. I think math metal is a more legitimate genre then any technical genres.
Think, what genre is meshuggah in? Not death metal, not black metal, not grindcore, doom metal, or whatever. What about dillinger escape plan? Not in any conventional genres either (maybe hardcore at a stretch). Fredrick thorenedals special defects? We could just classify them all as avant garde, I guess.
You don't understand the term. Technical death metal is death metal with a more sophisticated and involved playing style usually revolving around complex structures and time signatures though usually with a competent sense of melody and balance to the compositions as well. It doesn't just mean "it's hard to play." Only death metal is really classified as technical, and since all death metal is inherently relatively technical, it is reserved for bands who are more or less histrionic about their complexity.
Black metal can't be technical; if there is black metal sounding music which is more technical and has lots of shifts in sound/time signature, etc. it essentially becomes death metal just by virtue of black metal being more minimalistic. Drottnar - Welterwerk is a great example of this. "Technical 'black' metal", but it's not really. It's tech death with some black metal influences/sections (long segments of tremolo riffs, higher pitched vocals [a non-issue essentially, though] etc).
Meshuggah are categorized as post-thrash metal, which is a strange genre reserved for bands who take the riff 'n' rhythm based sound of thrash metal and distend it until it doesn't really resemble thrash at all in any literal sense, but rather sounds like a more "intellectual" (meh) and complex form of the 80's classic genre. It's actually kind of underpopulated but a few more bands utilize Meshuggah-like stylings. Bands similar to Meshuggah include Tool, Textures, Gojira sometimes...but none of those are really considered post-thrash, so it is pretty complicated, I admit. Meshuggah fits into "progressive metal" to some extent, though.
DEP are technical hardcore. No ifs, ands or buts.