Yeah I doubt they are truly unknown since this is a prog forum and most everything is at least able to be found but here's a few from way back(early 90's or so but not necessarily from the 90's)that I remember enjoying a lot(in no order):
Aragon - Don't bring the Rain (mainly for the absolutely killer 15 minute "the Crucifixion" that is even better than "Harvest of Souls." This album is a must for Marillion or PG era Genesis fans imo(if you can find it).
Bel Air - The Sleeping Beauty
Eduardo Bort - same Spanish prog from 1974 (some tracks have heavy psych guitars others feature nice mellotron). A really under rated prog gem.
New Trolls - Concerto Grosso number 1 (classical orchestra meets Hendrix jamming with Jethro Tull and Deep Purple).
Leviathan - Bee Yourself (Italian band; this is from 1990 and is it worth it for the 19 minute title track alone).
Lift - Caverns of Your Brain (70's US band with awesome epic symphonic track called "tripping over the rainbow"). The whole thing is a great and is a lost US prog classic imo.
Easter Island - Same as above so far as being a lost US prog classic from the seventies. Maybe not essential but worth having for the US collector at least.
Makkiwhipdies - His name is Nnnnnnnnnn- I may have been the one to suggest this band on PA(I don't remember for sure but I think I did). Anyway, it's maybe a bit cut and paste at places but imo this is a very enjoyable quirky symphonic prog album(originally from 1996).
I'm sure there are others but I can't think of them right now.
Edited by Prog_Traveller - November 05 2014 at 11:55