I'm really looking for something epic and heavy metal, like Sonic Mayhem's Quake 2 soundtrack, or something with a slight industrial techno vibe mixed in. Any suggestions?
Persephone by Year of No Light
https://www.youtube.com/watch?v=yhnkD7YxJ1s
2 drummers, bass guitar and 3 guitar players - 23mins long epic enough for you?
im currently looking for more metal like this.
but this one song should give you an idea of what their 3 previous albums are like. if you are looking for a story.
https://www.youtube.com/watch?v=xwVJnl7Vk5I
Based on the OP's post, I believe he is looking for instrumentals.
Mmm yummy instrumentals. Are you into progressive/technical metal at all? If so . . .
www.youtube.com/watch?v=PiQJ9gM_la0
www.youtube.com/watch?v=gtzb0FTN4BE
www.youtube.com/watch?v=vPH87Fm8kMw
Dream Theater also has some great instrumentals:
www.youtube.com/watch?v=1mwgv7WjPK4
www.youtube.com/watch?v=MshUFnfEfeA
www.youtube.com/watch?v=hNKjuC2kSPs
www.youtube.com/watch?v=7YnWnOLah7c
Liquid Tension Experiment if you into more insane musicianship:
www.youtube.com/watch?v=Ee6qZYjrGSU
www.youtube.com/watch?v=zhlUup1SFpc
www.youtube.com/watch?v=pmo1VW_wA_o
Then there's drone/doom/stoner metal. A lot of good instrumentals there. Here's some:
www.youtube.com/watch?v=uSTI-PV3aIw
www.youtube.com/watch?v=aIbNMAMBco4
www.youtube.com/watch?v=BbxxTbuolms
Some stuff from Electric Wizard, Jesu and Om as well.
Not exactly sure what your taste is though :-/
Isn't really instrumental, but Cult of Luna is a great metal band.
https://www.youtube.com/watch?v=VHJwd0XblL8
That is sick dude. I am going to be listening to this all day.
This Guy:
www.youtube.com/watch?v=FPMsV8xoEsI&list=UUFEzG_UKAx2Ane_Z1AiLetw
He has one album out at the moment and currently working on his second.
Yeah its pretty sweet. The album is called Ausserwelt