Best game soundtrack?

I would go for almost every game in the Super Robot Wars franchise (2nd OGs and Alpha 3 being the best in my opinion).
Chrono Cross had a great soundtrack as well.

My absolute favourite is The banner saga 2

Dark Souls, the first one. It's just...godly.

Machinarium and Assassin's Creed 2

Bastion

Payday 2 soundtrack.

Saints Row The Third main menu music is very cool :D Bastion soundtrack is good too, Dust an Elysian Tail has awesome soundtrack too

Symphony of The Night, excellent variation of songs that fit the ambient.

Dota 2

Arcanum was perfect atmosphere wise

shadow of the colossus, it really sets the mood :3

Magicka has an awesome soundtrack.

all songs need for speed underground 2

I'm a huge fan of the Dragon's Dogma / DD: Dark Arisen.
The music throughout the game flowed beautifully.
Dark Arisen's boss theme.

There are certainly a-lot of other songs from games that I enjoyed... but, as soon as I put DD:DA into my PS3 and it brought up the screen with its short replaying gameplay/music I had high hopes for the rest of the game. That thought was solidified by the starting town's theme simple and short yes, but I love it.

gta san andreas, gta 5, payday 2 and bioshock 1+2 the music playin in the radio and the loadingscreen

My fav soundtracks: Grim Fandango, Neverhood, Freedom Fighters (and other games with Jasper Kyd music), Chrono series, Beyond Good & Evil, Brutal Legend, GTA Vice City (VRock!!!:))

Sang-Froid - Tales of Werewolves - Damn addictive music ;
Dragon Age Origins;
The Witcher Music: Believe

Max Payne 3

NieR Gestalt & Replicant Original Soundtrack

Gothic III

Jungle Book on the NES

Rayman Legends! nothing else

Need for Speed Underground 2, Tomb Raider 3, Deus Ex Human Revolution, Batman Arkham Origins, Cat Lady, Mirrors Edge, GTA Vice City, Mas Effect 1 and 2 and best for me Silent Hill 2 and 3

Ps Forget about Hitman 1, 2, 3, 4, Max Payne 1 and 2