Games with soundtracks/music that you'll NEVER forget.

[The Spartan (Returns)]

The Total War Series.
Shogun, Medieval, Rome, and Medieval II, all had memorable soundtracks. Yes I left out Empire. Honestly I think it's worst one in the series, however not exactly bad. The absence of Jeff van Dyck is OBVIOUS in Empire.

Samples:
Medieval: Total War:
Arab Battle 2

Rome: Total War
One of my faves:
Frontend

One of the battle themes from: Medieval II: Total War

Dynasty Warriors 4
Awesome themes; the instrumentals are beautiful.
Here's a whole playlist of my favorite DW soundtracks.

Stronghold / Stronghold Crusader
A great RTS that not many know about. Really good soundtrack. Provides a great atmosphere, especially for a 2-D game.
A mix of songs from both Stronghold and Stronghold: Crusader.

Halo series
I just love the chants, and instrumentals in this one. Beautiful.
Halo

Halo 3:
Never Forget

Tenchu: Wrath of Heaven.
Sadame
Character Selection
Tatsumaru's Theme
Last Decisive Battle
Bamboo Forest
Oninage 3

Hitman: Blood Money

Finally, my absolute favorite, the Kingdom Hearts series.
Kingdom Hearts, is a great example how music can "make" the game or break it. To those of you who played Kingdom Hearts, do you think you can imagine the game with a whole different soundtrack? I definitely can't. I can almost say, that, the music of Kingdom Hearts IS the game. If it wasn't for the music in Kingdom Hearts, I could have possibly, dismissed it as a mere "kiddy" game (which unfortunately is what some people think of Kingdom Hearts, that didn't enjoy the story). With Kingdom Hearts, you either loved it or hated it, and the music is a big factor in loving Kingdom Hearts.

Kingdom Hearts:
Dearly Beloved
Simple and Clean

Kingdom Hearts II:
Dearly Beloved (KHII version)
Sanctuary
Sanctuary/Passion Instrumental
The 13th Struggle


Honorable Mentions:
Age of Empires Series
Beautifull Music

Bioshock

Elder Scrolls Series
Oblivion theme

Tekken 3 and upwards series:
Exception Lei Wulong's theme from Tekken 2

Tekken 3:
Law's theme
Lei Wulong's theme
Ling Xiaoyu's theme
Tekken 5:
A mix of songs

Golden Sun Series
Golden Sun:
Venus Lighthouse
Saturos Battle Theme
Golden Sun: The Lost Age:
Felix's Battle Theme

Pokemon (Portable Nintendo series)
Pokemon Red/Blue:
Opening.

Well that's all that I can think for now, as I'm in a hurry. I'll try to add more later.

[Monk]

You cannot have a thread about music in video games without this masterpiece. I have this on my mp3 and kick it on every now and then. The glory days of Duke, never forget.

When it comes to SNES memories of some of the best music i always think of Donkey Kong Country, that game had such good music it's crazy.

Another game is F-Zero, you just cannot get much better than this with only few exceptions.

[pevergreen]

For me:

F-zero X (the 64 version.)

Mute City among others, simply amazing.

Fire Emblem (GBA series)
The attack music alone is beautiful

Legend of Zelda: OoT and Majoras Mask

Rock 'n' Roll Racing

Black Sabbath & others I can't remember, it was basically a rock album with a nice game too.

[Xiahou]

Some good mentions here.

I'll submit the Persona3 soundtrack. A very memorable soundtrack for a very memorable RPG.

[Pannonian]

Bubble Bobble
Tetris

[Ramses II CP]

I bring this game up every time there is a gaming music thread, but the Descent 2 sound track is unforgettable. It amps you up so much it's actually harder to play the game when it kicks in. It suit the game atmosphere perfectly, and it's the only game soundtrack I still listen to today.

Halo is worth a mention too, but it's Bungie's previous series, Myth & Myth II that I remember most fondly.

[Fragony]

Just about everything Homeworld, space so big, you so alone

[The Spartan (Returns)]

You cannot have a thread about music in video games without this masterpiece. I have this on my mp3 and kick it on every now and then. The glory days of Duke, never forget.

Awesome theme. Definitely reminds me of the Dynasty Warriors 4 soundtrack.

Mute City among others, simply amazing.

Haha, I was looking for that one!

***
If you wanna be more nostalgic, try the Pokemon Red/Blue Opening.

Also Tenchu: Wrath of Heaven.
Sadame
Character Selection
Tatsumaru's Theme
Last Decisive Battle
Bamboo Forest
Oninage 3

*Updated first post

[Greyblades]

Civ 4 main menu music was quite good.

[Caius]

Civ 4 main menu music was quite good.

Yes. But Nothing is better than the whole Empire Earth I soundtrack.