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In this thread I will list each and every available FLAC soundtrack that GOG sells so people can find them easier in the store. I won't lists OSTs here if they can aleady be purchased through special editions or through upgrading editions. Updates for this thread are posted further below. Enjoy!

OSTs that include FLACs shipped with the game, either through special editions or through updated regular editions:

2064: Read Only Memories - Deluxe Edition Upgrade - NOTE: Requires base game
Another World: 20th Anniversary Edition
art of rally deluxe edition
Bad Mojo Redux
Blazing Beaks
Brigador: Up-Armored Deluxe
CHUCHEL Cherry Edition
Cultist Simulator Anthology Edition - NOTE: Doesn't specify further but FLACs seem to be included. A seperate OST with FLACs is available here
Creaks Collector's Edition
Deep Diving Simulator
Dex
Deponia 4: Deponia Doomsday
Divinity: Original Sin - Enhanced Edition
Divinity: Original Sin 2 - Divine Edition
Draugen Collector's Edition
Earth 2140 Trilogy
Earth 2160
Earthworm Jim 1+2: The Whole Can 'O Worms
Enter the Gungeon Collector's Edition Upgrade - NOTE: Requires the base game to function
Hacknet Ultimate Edition
Heroes of Might and Magic® 2: Gold
Heroes of Might and Magic® 5: Bundle
Hotline Miami 2: Wrong Number Digital Special Edition - NOTE: Remix EP
Hypnospace Outlaw + Original Soundtrack
Imperialism
Imperialism 2: The Age of Exploration
Kentucky Route Zero: PC Edition
Kingdom: New Lands Royal Edition
Little Nightmares II - Deluxe Edition
Master of Orion: Collector's Edition
Might and Magic® 6-pack Limited Edition
Might and Magic® 8: Day of the Destroyer™
Might and Magic® 9
Might and Magic® 7: For Blood and Honor®
Mosaic 1% Edition
Neon Chrome Deluxe Edition
Neverwinter Nights 2 Complete
The Outer Worlds: Non-Mandatory Corporate-Sponsored Bundle
Owlboy Collector's Edition
Pilgrims
Phantom Doctrine
Risen
Ronin: Digital Special Edition
Sea Salt: Digital Deluxe Package
Sacred 2 Gold
Serious Sam 4 Deluxe Edition
Shadowrun: Dragonfall - Director's Cut
The Silver Case Deluxe Edition
Simon the Sorcerer: 25th Anniversary Edition
Sins of a Solar Empire®: Rebellion Ultimate Edition
S.T.A.L.K.E.R.: Shadow of Chernobyl
S.T.A.L.K.E.R.: Call of Pripyat
S.T.A.L.K.E.R.: Clear Sky
Stellaris: Galaxy Edition
Stronghold: Warlords - Special Edition
Syberia 3: The Complete Journey
System Shock: Enhanced Edition
System Shock 2
The Talos Principle: Gold Edition
Tangledeep + Legend of Shara + Soundtrack - NOTE: Includes game Legend of Shara as well
Technobabylon: Deluxe Edition
Torment: Tides of Numenera - Legacy Edition
TRI: Of Friendship and Madness – Deluxe Edition
Turmoil
Tyranny - Deluxe Edition
Tzar: The Burden of the Crown
Unrest Special Edition
The Witcher 3: Wild Hunt - Game of the Year Edition
Wizardry 8
X4: Foundations
Yaga Bad Luck Bundle

OSTs as FLAC through seperate soundtrack purchase:

140 Soundtrack
8-bit Armies Soundtrack
Banner Saga - Soundtrack
Bloodstained: Ritual of the Night - Official Soundtrack
Botanicula Soundtrack + Art Book - NOTE: Doesn't include the OST alone but other things as well
Carrion Soundtrack
Colt Canyon - Soundtrack
The Coma 2: Vicious Sisters Soundtrack
Cuphead OST
Crypt of the Necrodancer - Danny Baranowsky Soundtrack
Crypt of the Necrodancer - Extended Soundtrack
Crypt of the Necrodancer - Extended Soundtrack 2
[url=https://www.gog.com/game/cryptark_soundtrackCryptark Soundtrack[/url]
ELEX Digital Extras - NOTE: Doesn't include the OST alone but other things as well
The Dungeon Of Naheulbeuk: The Amulet Of Chaos - OST
Egypt Original Soundtrack
Etherborn Original Soundtrack
Exit the Gungeon Soundtrack
Fatal Twelve Original Soundtrack
Finding Paradise Soundtrack

Foundation Soundtrack
FoxTail - Official Game Soundtrack
Frozen Synapse 2 Soundtrack
Frostpunk Original Soundtrack
Fury Unleashed Soundtrack
GoNNER Soundtrack - NOTE: GoNNER: Press Jump To Die Edition doesn't seem to include FLAC
GRIS Soundtrack
Hellblade: Senua's Sacrifice Original Soundtrack
Hollow Knight Soundtracks - NOTE: Includes the games and the soundtracks
Homeworld Remastered Soundtrack
Kingdom Under Fire: The Crusaders Soundtrack
Kingdom Under Fire: Heroes Soundtrack
The Long Journey Home - Official Soundtrack
Metal Wolf Chaos XD Original Soundtrack
Minotaur - Nod's route OST
Monstrum - Original Soundtrack
My Friend Pedro Soundtrack
Planet Nomads Soundtrack
Ruiner Soundtrack
Ruin of the Reckless OST
Runner3 - Retro Challenge Soundtrack
Haven Soundtrack
SEUM: Speedrunners from Hell - Soundtrack
Sound of Drop - fall into poison - Official Soundtrack
SpellForce 3: Soul Harvest - Digital Extras - NOTE: Doesn't include the OST alone but other things as well
Star Vikings Forever Soundtrack
Tahira Soundtrack
Tangledeep Original Soundtrack
Tangledeep ~ Arrange ~ Soundtrack
They Are Billions - Soundtrack and Art Book - NOTE: Doesn't include the OST alone but other things as well
Timberborn Soundtrack
Transistor Soundtrack
Treasure Adventure World - Official Soundtrack & Instruction Booklet - NOTE: Doesn't include the OST alone but other things as well

EDIT: Will add more as time goes by. Will also add links to avaiable OSTs on the storefront that include WAV files if there is any demand for them.

To soundtrack enthusiasts who want to stick to lossless, I highly suggest Bandcamp. All of the albums I bought there (dozens, mostly soundtracks) come in FLAC format.

Yes, then you don't need the game to buy the music.

I also use Bandcamp and highly recommend it. Just made the thread for those who want to know how many lossless OSTS are within the GOG store.

But maybe I update the links at some point so Bandcamp links are included whenever they're also available.

A double post but who cares. This is my thread and if anyone is against it you can get off my lawn.

Here I post and replace the date of the last time I've added something new to the main list. Should the list get too big I just link to a better documentation, like a pastebin or anything amongst those lines.

The pastebin may also include links regarding wav availability and also whether or not the OST is on Bandcamp.

Updated 21.10.2020 - added 140 Soundtrack.
Updated 09.11.2020 - added Cold Canyon - Soundtrack
Updated 12.11.2020 - added Tangledeep OSTs
Updated 25.11.2020 - added Cuphead OST
Updated 27.11.2020 - added The Outer Worlds: Non-Mandatory Corporate-Sponsored Bundle
Updated 05.12.2020 - added Haven Soundtrack
Updated 23.12.2020 - added Hypnospace Outlaw + Original Soundtrack
Updated 01.01.2021 - added Ronin: Digital Special Edition
Updated 13.01.2021 - added Yaga Bad Luck Bundle
Updated 21.01.2021 - added Fatal Twelve Original Soundtrack
Updated 29.01.2021 - added Cryptark Soundtrack
Updated 01.02.2021 - added Ruin of the Reckless OST
Updated 11.02.2021 - added Little Nightmares II - Deluxe Edition
Updated 09.03.2021 - added Stronghold: Warlords - Special Edition
Updated 19.07.2021 - added Sea Salt - Digital Deluxe Package
Updated 15.09.2021 - added Timberborn Soundtrack

Thanks for your work, this is really helpful for those of us who prefer lossless format over mp3.