i have played many games and listened musics.
What is your best sound tracks in your game life?
I would like to know your opinion on this.

my favorite album is persona 4 arrange album
"i'll fave my self (battle)" is best song i have ever heard

Some of my most memorable and favorite game soundtracks include:
Chrono Cross - Some incredibly beautiful music in this game. Favorite pieces: Dream of the Shore Another World and Time's Scar
Final Fantasy VIII - The music fit the game so well and stood well on it's own. Favorite pieces: Liberi Fatali and The Extreme
Final Fantasy IX - This is the one that made me realize how great video game music is, how it can really set the mood, and that I could listen to it outside of the game. The music really helped to make this game. Favorite pieces: You're Not Alone and Song from her Memory
Halo Series - I can't play FPS's because of motion sickness, but my husband plays this series and I always love listening to him play. Favorite pieces: In Amber Clad from 2 and Awakening from 4

i also like time's scar
its great!

Playboy: The Mansion OST by Yo-Yo Ma and John Williams was breathtaking, imho.

Irisu Syndrome's Soundtrack is the best there is..
There was a time when I was pretty much obsessed with it. And almost all the pieces of music in there are beautiful.

Other great music:
- Energy Breaker: The Prayer Bells Will Not Toll, Accursed Dusk, Unheard Feelings
- Diablo II: Caves, Wilderness, Lut Gholein
- FF VI: Phantom Train, Awakening, The Decisive Battle
- Ys Book I (TG-16): Palace of Destruction
- Ys Origin: Scarlet Tempest
- Chrono Trigger: Silent Light
- Thunder Force IV: Stand up against myself
- Thunder Force V: The Justice Ray part II
- RayCrisis: Levande Bleu
- Musha Aleste: Galvanic Gear

Final Fantasy VII. Finally after years I bought the piano album. Just wonderful. Otherwise I got only a few OST I like in whole. Normaly I only love the upbeat tracks.

Well shall I begin our lessons...
final fantasy: crisis core and 7,8,9,10 and 10-2, and 12
Chrono Cross and Chrono Tigger
Parasite Eve: 1 and 2
Disgaea: 1 and 2
Star Fox (snes)
Resident Evil: Zero,1 remake, 2 Save themes Got to love it but all of them for sure, 3,4,5 and code veronica
Silent Hill: 1,2,3,4 Shattered Memories, Origins, Silent Hill: Homecoming and Silent Hill: Downpour
Yoshi's Story
Star Ocean: All of them but three have my win..
and last but not lease Golden Sun 1 and 2

All of these I dear not remove from my fiio x3 64 GB card they all bring back sooo much memories even at night when I sleep they help... but the list goes on in my mind

Xenogears
Xenosaga
Xenoblade Chronicles
Valkyrie Profile 2
Golden Sun
Nier
NiGHTS: Journey of Dreams
Sonic Adventure 2
Elder Scrolls III-V
Zelda, Majora's Mask, Link's Awakening, Twilight Princess
Final Fantasy X
Shadow of the Colossus
Tetris Attack/Panel De Pon
Fragile Dreams: Farewell Ruins of the Moon
Folklore

Yeah, there are more.

Anything made by Alexander Brandon.

Ok, slightly bizarre twist, in-game my favourite soundtrack is actually Minecraft.... No, really. The number of times the dynamics of a successful find or freak encounter have matched the (un-scripted portion) of the soundtrack have been brilliant.

In life I love the ESIV Oblivion soundtrack - makes the run down the sea front much more pleasant

Final Fantasy XI Online
Final Fantasy XIV A Realm Reborn
Castlevania: Symphony of the Night
Mass Effect
Mass Effect 2
Mass Effect 3
Dynasty Warriors series
Grand Theft Auto Vice City
Grand Theft Auto San Andreas
Star Wars Knights of the Old Republic
Star Wars Knights of the Old Republic II The Sith Lords
Jade Empire
Front Mission 3
Samurai Warriors series
Warriors Orochi series
Saints Row 2
Saints Row The Third
Saints Row 4 (Only thing I like about this game IS the soundtrack)

Really tough, because some games have a couple of amazing tunes, but lots of filler (I must have played the various Squaresoft and Bioware games hundreds of times, but I can't really remember any of the music from any of the games - like, at all!) Games need to have really infectious songs, or have pieces of music that brilliantly add to already powerful moments to really stick in my mind. So for example, I can remember the Nibelheim music from FF7 or the Shepard and Joker look at the restored Normandy music etc etc, but mostly everything else just kind of fades.

But anyway, here's a few games whose music did stick in my memory:
Persona 4.
Halo: Combat Evolved.
Demon's Souls.
Advance Wars 2.
Any of the Ace Attorney games.
Castlevania: Symphony of the Night.
Mirror's Edge.
Infinite Space.
Command and Conquer.
Valkyria Chronicles.
Marvel Vs Capcom 2.
Street Fighter 2.
Cross Edge.

And probably lots more games, but its been years and there's been a whole hell of a lot of games, so...

Sonic Adventure 2
Elder Scrolls III-V
Zelda, Majora's Mask, Link's Awakening, Twilight Princess
Final Fantasy X
Shadow of the Colossus
MAFIA

mostly anything by yatsunori mitsuda (eternal number 1 forever and ever: chrono cross ost).
anything by koh otani (pertains to anime primarily)
john williams? (for his reused scores in several SW games. nothing beats hearing duel of fates while fighting for first place at 820 mph in a hard as fuck track in sw episode 1 racer).
not composers, but series:

castlevania
megaman/x until x5, x6 and over had terrible music, a horrible prelude of capcoms decline.
final fantasy
TLOzelda

All Genso Suikoden games have excellent music. I can listen to them forever.

Gotta be The Legend Of Zelda: Majoras Mask! Fits perfectly to the dark, emotional tone of the whole game!