Immortal is a unique black metal band from Bergen, Norway only consisting of Abbath and Demonaz Doom Occulta

Abbath - Bass, Vocals, drums, guitars, and synth
Demonaz - Guitars and lyrics

Their first album is traditional black metal "Diablolical Fullmoon Mysticism"

This song is Cryptic Winterstorms
Guitars Demonaz and Vocals Abbath

http://www.youtube.com/watch?v=5zO_3RvBJkM

From there second album "Pure Holocaust"
They took a huge step in black metal.
Guitars Demonaz and Vocals Abbath

From the song "As The Eternity Opens"

http://www.youtube.com/watch?v=2CwTz...eature=related

Then From the album "Battles In The North"
Guitars Demonaz and Vocals Abbath

The song "Blashyrkh (Mighty Ravendark)"
This video is funny and pretty cool.

http://www.youtube.com/watch?v=32n1AK6o5i0

From the album "Blizzard Beasts"
Guitars Demonaz and Vocals Abbath

The song "Mountains Of Might"

http://www.youtube.com/watch?v=AJ9XE...eature=related

From the album "At The Heart Of Winter"
On this album Abbath does the guitars while Demonaz wrote the lyrics due to an injury

The song "Withstand The Fall Of Time"

http://www.youtube.com/watch?v=Z2O-da4hHq4