Arkham Asylum, Arkham City, hl2
In terms of "would listen to without playing the game" definitely Hotline Miami 2 - Wrong Number.
Usually most game soundtracks just are babbling away, and I don't remember them except maybe the main theme.
Ratchet and Clank (Metropolis) was pretty memorable, same goes for FFX's "To Zanarkand" and The Wolf Among Us's main theme
Oh, and the whole OST of Guacamelee! is good.
Shadow of the beast (death scene) - Amiga
Shadow of the beast (menu & in game) - Amiga
Deus Ex - Human Revolution - End Credits theme (game file rip 1_EndCredits.str_0.wav_1
World of Warcraft - Putting your foot in Stormwind
Killing game show - Amiga
Xenon 2 Megablast - Amiga (in game and intro music)
Gods - Amiga
Turrican 2 - Amiga
R-Type - Amiga
Outrun - Arcade
Bubble Bobble - Amiga
Chuck Rock - Amiga
Project X - Amiga
Assassins Creed Revelations Trailer music
Assassins Creed Revelations - Main theme
Annoy 2070 - Some good tracks
Cities XXL - Some good tracks
Not quite a game but a legend from 1992 : Jesus on E's - Amiga
One of my all-time favorite games. The soundtrack is epic.
mmm vanilla WoW
Also, EVE
Last but not least, my all-time favorite PC game, SWG. Not the greatest OST by any means, but theres some great diddys in there that really bring back a lot of good memories. The feels are strong!
superbrothers sword & sworcery
my favourite by far is civilizations beyond earth
The Halo CE soundtrack! :D It's so great!
The Deus Ex: Human Revolution soundtrack.
The Crypt of the NecroDancer soundtrack is a close second.
to me it has to be metroid prime 3 corruption
Morrowind has definitely one of the best soundtracks.
Other favorites are Sonic 1, 2, 3, Zelda: Wind Waker, World of Warcaft, Diablo 2, Wings, Hotline Miami (still haven't played the sequel yet), Pokemon let's say Platinum, Mega Man 2. And Knuckles.
FTL! The soundtrack fits the atmosphere of the game perfectly. I have a few of the songs in my programming playlist.
With time-codes in the description for those that want to reminisce ;)
Metal Gear Solid [1998]
Katamari Damacy
The first one. The sound track as amazing in that game.