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

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

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

• 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)

Donkey Kong Country. Good Jams!

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

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

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.

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

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

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.

Final Fantasy XIV

C418 - Sweden

Uncharted for original soundtrack.

Burnout Paradise for licensed soundtrack.

Some of my favourites:

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

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

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

Metal Gear Rising: Revengeance

My personal favorite is Stains of Time

Bastion

Doom 2016, hotline Miami, neon white

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

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

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

Hear me out.

MechWarrier 2.

Killer Instinct (original and 2013).

Tyrian 2000

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

Valheim!

Final Fantasy ix and X.

Their vibes just fit both the games respected themes and narratives.

Besaid Island from x is one of my all time favourites. Roses of red from ix a close second.

Bastion and Transistor also come to mind from Super Giant Games.

-Assassin's Creed Odyssey: Legend of the Eagle Bearer, The 300, Odyssey(Greek version).

-Assassin’s Creed Origins: Main theme, Return of the Medjay, Bayek of Siwa, The Shimmering Sands, The Battle of Krokodilopolis.

-Assassin’s Creed Valhalla: Main theme, Shadow Walker, Out of the North.

-Battlefield 1: Nothing Is Written, Avanti Savoia, Hunted, Cape Helles, Zeebrugge Harbour, Sand and Dust, In the Name of the Tsar, Grace and Glory, Sword in Hand.

-Battlefield V: Legacy Theme, Under No Flag, Far From Home, Spitfires, Rotterdam In Ruins, Devestation, I Vow To Thee My Country

-Battlefield 4: Warsaw Theme, Stutter theme, Jin Jie's Revolution, A Theme For Kjell, Fishing in Baku.

-Battlefield Bad Company 2: The Storm, Snowy Mountains, Operation Aurora.

-Call of Duty: Modern Warfare 2: Opening Titles, Extraction Point, Coup de Grace, Chain of Command, Esprit de Corps, Protocol.

Everything else here 100% deserves the credit but I didn't see anyone mention Divinity: Original Sin 2, which is also amazing.

Tons of little songs I found myself idly humming for days/weeks after playing and a thoroughly epic main theme.

The finale of the game where time slows down and the music swells is one of my favorite gaming moments.

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.

My favorites:

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

The WWE SmackDown VS RAW series had some great soundtracks.

Especially SvR 2007

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

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.