Seeing that I truly believe that you know more about this band than I do, O RELIOPS of melodious stench...I won't pontificate (I know that's hard to believe ;) )
I first became aware of this band circa 2004 or so when doing internet searches relating to C.S. Lewis and J.R.R. Tolkien. I have always appreciated musicians (especially rock/pop artists) who wrote music that adapted or was inspired by works of fantasy, science-fiction, and great novels. I was pleasantly suprised that GLASS HAMMER had two albums that fit this criteria: "Journey of the Dunaden" (1993) and "Perelandra" (1995). Although I have to this date heard neither of these albums I do recommend to one and all the novel by Lewis, "Perelandra" (the middle novel of his Deep Space Trilogy). Using Amazon.com maybe for one of the first times, I purchased the "then" current disc of GH entitled "Shadowlands," which is also a reference to the writing of C.S. Lewis.
It is a magnificent album and I post (below) my favorite track from this 2004 disc. The vocals of Susie Bogdanowicz over/under & with the male vocalist is ethereal and beautiful...striking in that it's telling the story of a very nasty and brutish war stallion during a crucial cavalry battle.
I of course have heard other songs by GH (via various sources) but they are notoriously reticent about letting full versions of their songs appear either on Youtube or their own site(s). I think this is a mistake as the more their music is made readily available the more rabid fans they attract. They are much beloved neo-prog band (3rd wave) and constantly receive rave reviews on various prog-rock sites.
They are Eugor's: FAVORITE ROCK/POP BAND # 63 GLASS HAMMER