The Grand Conjuration - Enslaved
Benighted - Nick Drake
Weakness - Led Zeppelin (OK, so Bonham wouldn't fit in, but the song has a
'No Quarter' kind of feel, so imagine it in that vein)
Isolation Years - Linda Perhacs (or maybe Trees or Pentangle. A female folk vocal would fit nicely)
Closure - Burzum (it would be interesting to hear the song with that Varg ambience)
A Fair Judgement - Black Sabbath (you might think Ozzy's voice would ruin the mood, but just listen to the Sabbath song 'Solitude')
Face of Melinda - Uriah Heep (Think 'Come Away Melinda' part 2. Deep Purple would also give that song a fair go)
For Absent Friends - Camel (the more obvious choice would be 'Ending Credits', but I think Latimer's lead would suit this song well)
And for something totally off the wall:
Ghost of Perdition - Focus