Every Supergiant game should be on this list,

NieR:Automata

FFVII (especially the 10 minute FFVII remake of One-Winged Angel)

Cyberpunk 2077 had some good ones. I'm digging I Really Want to Stay at Your House

Hades

Kingdom Hearts (Wave of Darkness is pretty great)

It's not my normal thing, but Doom's soundtrack really gets the juices flowing and fits beautifully with fast paced frantic gameplay.

Edit: 2016 Mick Gordon

Chrono Trigger, of course. Some legendary tracks in there that transcend their limitations. The Deadbolt OST, Katana ZERO's OST. Nier Automata, Street Fighter V.

Oblivion and Skyrim as well. Really there are too many excellent game soundtracks to possibly list in a comment

GTA Vice City

Hotline Miami. God damn, so good.

Bloodborne has an amazing soundtrack. Here's an example of one of the epic songs:

https://youtube.com/watch?v=NHIkUzmNmc0

• Battleblock Theater (goat main menu track)
• Hades (amazing combat music)
• Hollow Knight (most atmospheric)
• Undertale + Deltarune (great range, captures a lot of emotions throughout the story)

Here are my personal favorites:

AI War / AI War 2 - Pablo Vega
Dragon Quest series - Koichi Sugiyama
Final Fantasy VII - Nobuo Uematsu
Final Fantasy XI - Nobuo Uematsu and others
The Last of Us - Gustavo Santaolalla
Medal of Honor - Michael Giacchino
Offworld Trading Company - Christopher Tin
Stellaris - Andreas Waldetoft (I didn't notice that this game was just an idle clicker for a long time because the music was so damn good)
Tidalis - Pablo Vega (especially the piano versions)
A Valley Without Wind - Pablo Vega

Persona 5 and 4. The soundtracks can stand on their own as just great music.

Donkey Kong Country. Good Jams!

The legend of Zelda always had the most iconic themes (personal favorite is Dragonroost island from Wind waker, but they really all have some amazing music).

I also listen to the Chrono Trigger and Octopath traveler OSTs on my free time.

Sonic Mania is one I always fall back on, the tracks are fun as hell and I don't think there's a single one I don't like. Shoutout to the Studiopolis act 1, Studiopolis act 2, and Press Garden act 2 tracks.

Cyberpunk 2077,Doom 2016, Doom Eternal, Horizon Zero Dawn and Forbidden West, Zelda Breath of the Wild, and the Metal Gear Series.

Witcher 3. Surprised I haven't seen it yet. The vase game is totally the best in my ears, especially the Skellige soundtrack but the expansions are also a blast!

https://youtu.be/NknjE2SBPxw

For licensed tracks, Burnout 3 Takedown wins it for me. Great driving music (obvs) and generally just a blast of uplifting pop punk.

Resident Evil Outbreak -- Main Theme

Ico – You Were There

Tomb Raider -- Main Theme

MGS 3 – Way to Fall (Starsailor)

MGS 4 – Love Theme

Hollow Knight -- City of Tears

Grand Theft Auto III -- Main Theme

Furi – You're mine (Carpenter Brut)

Red Dead Redemption -- El Club de los Cuerpos (Bill Elm and Woody Jackson)

Gran Turismo 3: A-Spec -- Light Velocity (Isamu Ohira)

Commandos 2 -- A Storm is Coming (Mateo Pascual)

Assassin's Creed 2 – Ezio's Family (Jesper Kyd)

Hitman Contracts -- Main Menu Theme

Death Stranding – Death Stranding (CHVRCHES)

Mafia -- Running Man Song (Latcho Drom - La Verdine)

Fallout New Vegas -- Jingle Jangle Jingle

Age of Empires 2: Age of Kings -- Track 1

Age of Mythology -- Chocolate Outline, prostagma?

Silent Hill 2 – Promises/Theme of Laura

Tactics Ogre – Theme of Black Knight

Project Wingman – Kings (Jose Pavli)

Ace Combat 7 – Hush

ivalice

Ivalice Collection

Vagrant Story -- Wyvern Battle Theme

Final Fantasy Tactics -- Antipyretic

Final Fantasy XII – Battle on the Big Bridge

Besides many of the ones others have listed, I really enjoy a lot of the music from Katamari Damacy.

Maybe this answer is cheating, but Smash Bros Ultimate has the best soundtrack of all time. It's got over 1000 tracks, including some of the most recognizable video games music of all time, and some amazing remixes.

Just of the top of my head:

• Doom (2016) - BFG Division - Mick Gordon
• Nier: Automata - 美シキ歌 (A beautiful Song) - Keigo Hoashi
• Super Meat Boy - The Battle of Lil Slugger - Danny Baranowsky
• Metal Gear Solid - Encounter - Takanari Ishiyama, Gigi Meroni, Kazuki Muraoka, Lee Jeon Myung and Hiroyuki Togo
• Hades - No Escape - Darren Korb

C418 - Sweden

Final Fantasy XIV

Some of my favourites:

• NieR Automata
• Katamari Damacy
• Chrono Trigger
• DOOM 2016
• Celeste
• Sonic Adventure 2

Uncharted for original soundtrack.

Burnout Paradise for licensed soundtrack.

Bastion

Metal Gear Rising: Revengeance

My personal favorite is Stains of Time

Doom 2016, hotline Miami, neon white

Life is Strange soundtrack. That is, including all the licensed songs.
Was so good, got me into playing guitar.

Mega Man 2. Can't believe I scrolled the whole comments and did not see Mega Man 2.

The Ghost of Tsushima soundtrack takes me back to the game every time

Tyrian 2000

Killer Instinct (original and 2013).

for me, WH40k Mechanicus probably has the best. Every track is awsome and fits the setting perfectly.

Here is a playlist of the soundtrack if you want a listen.

Jet Set Radio Future is up there for me. Even twenty years later it sounds like it came from the future.

Hear me out.

MechWarrier 2.

Morrowind. It's iconic.

Risk of Rain 2 for GOAT Any supergiant game, but Transistor and Hades are a cut above

No Man's Sky

My favorites:

• Command & Conquer (the first one)
• Hearts of Iron 2
• TES Morrowind
• Valheim

Half Life 1 and Forsaken (1998).

Both of those CDROMs worked in normal CD players and they lived in my hifi for AGES

Valheim!

There are many I love but I gotta go with Evergrace. I know it's great because I've never played the game and am still always putting this one on.

Though if best means best in the context of the game then I'd probably have to go with Sim City 3000. The OST sounds fantastic and really captures the vibe of a city that is wires and plumbing sprouting into something living and breathing.