Your first OST

Never bought a OST. I DID download some, though. :P

Prince of Persia: Warrior Within, that soundtrack was just amazing, I was listening to that for very long time

I don't quite remember, but I guess it was Chrono Cross. :)

Final Fantasy 10 OST. It's fabulous.

I only remember my first pony.

Heavy Rain OST is what comes to my mind

I still listen sometimes

View attached image.

I don't actually "own" any, but the first one I got was the Red Alert 2 OST.

When I like a OST, I only listen it on youtube, I don't think I'll ever buy some OST.
I spend hours to listen Ori and the Blind Forest soundtracks recently.

The first soundtrack I actually BOUGHT was probably from Journey, the PS3 game, by Austin Wintory.

https://austinwintory.bandcamp.com/album/journey

Devil May Cry 3. Best soundtrack of anything, ever.

My first CD soundtrack - Pulp Fiction <3
and best OSTs from games: Alan Wake (+American Nightmare), Beyond Good and Evil, Journey, Brothers a Tale Of Two Sons :)

I have not.

I bought PAYDAY 2's OST a little while ago. Beside that, i think i own some of the soundtracks of Tekken series.

Soundtrack from all of The Witcher games. Breathtaking. Unforgettable experience.

Dont think i have bought a soundtrack for a game but i think one of the first soundtracks i ever got was with the black version of Killer Instinct64

Soundtracks from these games: Earth Worm Jim, Doom, Rock & Roll Racing, Zelda and Goldeneye are some of my favourites

The TimeSplitters 2 OST was probably my first in what has been a great affair in game OSTs over a period of about 13 years (I started finding the OSTs on my own when I was 7.) Most recently, I think the Killing Floor 2 and Witcher 3 soundtrack was my latest buy, but I didn't really have to search far and wide for those, even though Tripwire didn't include all the damn tracks in the KF2 OST on Steam (thankfully, I already had the rest of the tracks, but I feel bad for others who have to buy the rest), Before that, the most recent physical copy of an OST I had acquired was Risk of Rain's, which I got in the Indiebox physical release of the game.

Other notable favorites: Smash Bros. Brawl, All of MGS' musical scores, Doom, Every Zelda game (specifically Wind Waker, Majora's Mask, and Awakening being my favorite OSTs).

Edit: I feel really stupid for not Including Hotline Miami's OST, as a commenter below me had mentioned. That soundtrack itself inspired me to get drawing again. 2's was easily the best.

Never bought/downloaded one, but I did listen to some tracks from the To The Moon OST on youtube a lot

Gladiator :)

First and only was the soundtrack to Unreal Tournament that came as a CD in the box

i think i bought one at some point but it was those game editions that come with the soundtrack.

one of the first game soundtracks i really enjoyed was Castlevania: Symphony of the Night.
i still listen to it from time to time, it's just too beautiful.

Hotline Miami OST is one of my favorite soundtracks to listen to out of game

For the title ("first OST"): Kikujiro no natsu (but it is a movie, Joe Hisaishi later composed the music for Spirited Away, I assume that is a better known piece)

For game, I do not know, I collected them either via extracting from data files or sometimes downloading from various sources. Now with Humble Bundle I have countless completely legal OST-s too, and I did buy some bundles only because they came with OST-s.

Bastion. it's got great music.
boop bump!