Most Relaxing Song You heard in a game.

[Shepard's Shadow]

Mass Effect has awesome music.

 

[Darth Brownie]

The velvet room music in the persona games

(will include video once when i won't be at work)

 

[Halla Saviour]

From the first Halo game, last song on the soundtrack, called Halo. The very last part of it, maybe half a minutes worth.

And Serah's Theme from FFXIII.

 

[The Amazing Tea Alligator]

Osmos or Eufloria

 

[Irradiated Tiger]

Halo 3 ODST's theme when just roaming the city. Nice and light.

 

[Ldude893]

The music of Sim City 4 can be very relaxing at times. Here's two of them.
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There's also "Triage at Dawn" from Half Life 2. Even if it's short, it's still rather soothing.

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[RatRace123]

I used to fall asleep to this song.

Oh yeah, Water world from Mario 64! That is my definitive choice in relaxing game music.

Gotta also give credit to Mario Galaxy for this one:

 

[twaddle]

Dearly Beloved on the Kingdom Hearts Soundtrack

hell yes

 

[Stagezilla]

The music that plays in Nier's home town, puts me to sleep every time

 

[octafish]

Spoiler: Leonard Cohen's Dance Me to the End of Love by Madeleine Peyroux from The Saboteur

 

[Thunderhorse31]

All the entries so far are excellent.

Contributing:

 

[[Kira Must Die]]

I like this one:

 

[Arkhangelsk]

Dearly Beloved on the Kingdom Hearts Soundtrack

That song makes me feel all fuzzy inside. I just feel completely at peace with the world. Although I'm torn if the one from KH2 is better or not...

 

[Ridonculous_Ninja]

It's very relaxing.

 

[lukenhiumur]

Portal had very relaxing music

 

[Azure-Supernova]

Most of the overworld music from The Elder Scrolls IV: Oblivion had some lucious soothing qualities. Makes me wonder why there's even a mod to pause the soundtrack...

How did I forget how soothing Natasha Farrow was!?

 

[Treeinthewoods]

"Far Away Promise" from Xenogears. Simple beauty...

http://www.youtube.com/watch?v=dEgobbuWI8Y

Teach me how to embed video from YouTube, please?

 

[Ultra_Caboose]

I've got a few...

Fisherman's Horizon, FF8

Chrono Trigger - Time Circuits

Xenogears - Shevat: the Wind is Calling

A Link to the Past - Kakariko Village

 

[TriggerUnhappy]

I have two, though one is technically by Aphex Twin.
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(though for Old Snake, mainly the guitar parts)