Kingsfield 2 and 4 take top spot for me, calm and cool tracks I can listen to over and over. As good as the post mike wazowski fromsoft music is after a while the loud orchestral stuff kinda blends into each other and becomes quite grating over time. Its good ingame in the setting or boss fight but i dont like listening to it independently.
Older fromsoft music is peak and a lot of their older games are in my top 10 game music.
Kingsfield 4: https://youtube.com/playlist?list=PL7YuVu11Ud-JlvI3O7kqTS-gWNxgf5F0l
Armored core 1: https://youtube.com/playlist?list=PL48C29B22778C558A
Then there’s the Nier replicant ost which dominates everything ever: https://youtube.com/playlist?list=PLTSayM5g0IpZB3XGGIHAbvZgJtqL6WN76
Dmc 1,3,4,5 and metal gear rising all good.
Silent hill and signalis if I’m in the mood.
Black Moon Chronicles
Dune 1
Dune 2000
Emperor Battle for Dune (see the pattern, nearly all Dune movies and games had consistently great soundtracks… except the Verhoeven movies)
Warhammer 40000: Mechanicus
Homeworld
Ascendancy (old game with ultra space-factor atmospheric music)
Stellaris (bland lately but vanilla and few first expansions have great classical sci-fi themes)
Endless Space 2 (great trinity of space game music with the two above)
Master of Orion 1
Mass Effect (mainly 1)
Heroes of Might & Magic 3 and 5
Warcraft 2
World of Warcraft, not all but the sheer lenght of soundtrack make for choice of few hours of great music
Morrowind
Star Wars KotOR
Warhammer: Dark Omen
Warhammer 40000: Chaos Gate (the old one)
Civilization 4-6 especially title themes for all vanilla and expansions