From my personal gaming OST playlist:

Ezio's family (Assassins Creed 2)
Blood Tears (Silent Hill)
Tender Sugar/Waiting for you (Silent Hill 4)
Lacrymal (Resident Evil Code Veronica)
Free from Fear (Resident Evil 3)
Ada's Theme (Resident Evil 2)
The Ties That Bind (Leon) (Resident Evil 6)
Ende - Mick Gordon (Wolfenstein New Order)
Hellwalker - Mick Gordon (Doom 2016)
Everything is going to be okay - Mick Gordon (Prey)
Devil Trigger Opening Remix (Devil May Cry 5)
Song of the Ancients/Popola (NieR)
Die Toteninsel (Signalis)
Crysis 2 Main Theme (Hans Zimmer)
Crysis 3 New York memories
Pairbond (Bioshock 2)
Ant Village (Stray)
Long Way Down (Evil Within)
Remembrance (Batman Arkham City)
117 (Halo 4)
Halo 3 Warthog Run

Video-game soundtracks that stuck with me throughout the years

Shogo M.A.D - Red Riot
Killer 7 - Sweet Blue Flag
Jet Set Radio Future - The Concept Of Love
Metal Gear Solid 2 - Twilight Sniping
Dark Souls - Souls of Fire
Mirror's Edge - Kate (Puzzle)
Midnight Club 2 - Round About Midnight
Splinter Cell Chaos Theory - Bank
Hitman 2 Silent Assassin - H2 Exploration
Max Payne 2 - Late Goodbye
Metal Gear Rising Revengeance - Rules of Nature
The Getaway - Art Appreciation, Out of The Frying Pan & A Touch of Class
Saints Row IV - Image As Designed 5
Deus Ex - The Synapse (Hong Kong Streets)
Red Dead Redemption 2 - The Course of True Love

Everybody's Gone To The Rapture.

plumbers dont wear ties

https://www.youtube.com/watch?v=YBRFZdzAHgk

MYST
Homeworld
Deus Ex: Human Revolution

Hollow Knight (and Silksong) have some absolute bangers.

FFVI.

Hail to the king, baby.
https://www.youtube.com/watch?v=r1rbdoUmZGI

https://youtu.be/UPmoN5krdBU
https://youtu.be/JEwW9sz8OKE
https://youtu.be/w4nMAFSAAds
https://youtu.be/CXt-zvTSFMg
https://youtu.be/48_UrZcZ_os
https://youtu.be/F_bUIiEP9q8
https://youtu.be/9M3BKvdbmls
https://youtu.be/dzbfqy7shyA
https://youtu.be/9jG4xZrBZLY
https://youtu.be/WHTzdpSwbuA

For me, it's dying light, the trailer music is fantastic:

https://www.youtube.com/watch?v=nH6vvgUjIhs

Originally posted by yui8:

TC said soundtrack, NOT soundtracks!

https://youtu.be/pJTGAtLH7Hw

soundtracks I listen to the most:
- Final Fantasy XIII (and the two sequel games, to a slightly lesser extent)
- Vampire the Masquerade Bloodlines (one of the song titles is my profile custom url!)
- Umineko and Higurashi (though I don't think of them as games, I suppose nobody really talks about "favourite book music")

and a bit less these days, but still very important to me:
- Transistor
- Trails in the Sky games + Crossbell duology
- Great Ace Attorney duology
- SMT: Nocturne

Aria Math