Frownland

Well these are all some great influences jazz, classical and avant-garde wise (not counting Slayer and Meshuggah, that's probably where they emulate their rage from) but I can hear a lot of Mr. Bungle in their music, and bands such as Dr. Nerve have elements of their music that can be heard in miRthkon's work. Apart from that, I'd say rock in opposition/avant-prog music is the only other precursor that specifically caters to the sound of miRthkon, without going into the specific genres that the band meshes into their music.

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Studies show that when a given norm is changed in the face of the unchanging, the remaining contradictions will parallel the truth.

Surell

all in the vein of metal and that one prog song.

Somebody mentioned the Allmans:

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Goofle

I was going to suggest Mouse On The Keys, but they are hardly "furious". Either way, check them out. However, The Flying Luttenbachers are certainly a fitting band.

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Big Ears

1971 The Inner Mounting Flame by Mahavishnu Orchestra
1973 Birds of Fire by Mahavishnu Orchestra

1974 Isotope by Isotope
1974 Illusion by Isotope

1976 Go by Go
1976 Go Live from Paris by Go
1977 Go Too by Go

1976 Strange New Flesh by Colosseum II
1977 Electric Savage by Colosseum II
1977 War Dance by Colosseum II

2008 A Very Nice Album by Nigel Kennedy

Surell

Also:

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Engine

Once I made a thread about Dazzling Killmen.

It got some mixed responses a year or so later.
Maybe I'm doing it wrong but they're still the first band that pops into my mind when I hear a phrase like "furious jazz rock"

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Like an arrow,
I was only passing through.

Stephen

After listening to some previews I like what I heard but I'm not sure I would have ever labled them as jazz rock. If anything they seem reminiscent of someone like Big Black. Will track some down and give it a proper listen anyway.

Engine

Yeah, I suppose you're right.
Still, I feel that there's some Jazz in there - more so than in typical noise rock or post rock or math rock, et cetera.

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Like an arrow,
I was only passing through.

snagglepuss

Brand X
Mahavishnu Orchestra
Colosseum II
Santana(Caravanserai and later)
Passport

jawbreaker

Eric Johnson's jazz-rock project, Electromagnets could be mentioned here.
"Furious" jazz-rock makes me think also of jazzcore, whose best representative is John Zorn and the supergroup Painkiller.

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"the secret of a long life is to try not to shorten it". My name is nobody, Sergio Leone, 1973