When did Metal start to get structurally extreme?

I feel like Napalm Death's "Scum" and "From Enslavement..." might've been shortcuts for a lot of metal dudes who might not have heart Deep Wound/Siege/Repulsion. I remember buying the latter when I saw it and not knowing it was supposed to be grindcore, which wouldn't have meant anything to me in 1988, and was just some crazy new style of metal.

Growl, growl, growl your throat
Droptune down to C
Metal is
Metal is
Metal is
Metal is
Structurally extreme

Larks' Tongues in Aspic is the progenitor of exploded structure in metal for me. The first time I heard it I thought "oh, Metallica!" Not sure who the first metal band to take insp from Larks was though.

Red! by King Crimson.

there is no end to 70's stuff though. as far as fucked-up hardrock/metallic/prog goes. an ilxor recently put this up on facebook. 1976. it shreds like a beast.

https://www.youtube.com/watch?v=X11dagduA0A

I haven't read this thread yet but there probably are bands similar to Voivod, perhaps inspired by them
If You Like Voivod, You Are Sure To Like...

The only record that sounds like Voivod at all to me is Die Kreuzen's October File...

i dunno about the historical facts of it but yeah 'scum' seems like a good idea to me, throw a buncha brief little misshapen blurts together and you've got a weird structure right there

alright, i kinda lost steam on the whole archeology project so i'm going to go ahead and say late '81 .... combination of us hardcore; deep wound, seige, black flag, youth korps, etc... swedish punk like asocial... uk crust like heresy....... i'm not strictly talking grindcore or deathmetal or techy prog metal, it's more of a disjointed structural thing that i don't think i explained very well but i think that's where and when and with whom it started....

nd's scum fits the bill, but that's '87 - apparently they used to gig with amebix and varukers and such, so i'm sticking with my half-assed theory......

anyway, thanks for some great tunes y'all, watchtower are rocking so hard, dude's got legit set of pipes......

two more things i discovered:

-don't do a youtube search for "deep wound" unless you got a strong stomach......

-there is metal in nunavut:

https://www.youtube.com/watch?v=dAflHne54fA