What game has the best Original Soundtrack??

Grandia! <3

https://www.youtube.com/watch?v=J4fUdY1PGhY

Assassins Creed 2 probably is the best one for me.

Giana Sisters twisted dreams ?

Or Deus Ex HR

I really love the soundtrack from Remember Me
like, the game was nothing special and I won't go back to it ever, but I sometimes still listen to this thing.

Anno 2070
Also Anno 1404

I love the music from Valiant Hearts: The Great War

Depends of the kind of Music: Zelda or Final Fantasy does have great OSTs, but for example in an old-school 8-bit style, VVVVVV is great too.

I am Bread :P

It's incredible that no one mentioned any Final Fantasy games. I consider Nobuo Uematsu as one of the best composers in videogames

Payday?Final Fantasy ?Anno series?

Fallout 3, or Diablo 2

Ori and the Blind Forest <3

Quake, Doom 3, Tony Hawk's Project 8, Tap Tap Revenge, Rock Band, Guitar Hero: Warriors of Rock, Need for Speed: Undercover, Midnight Club: Los Angeles, Resistance 2, The Darkness II, Call Of Duty: Black Ops II, Dead Island Riptide, FIFA 14

Devil May Cry 4 [Shall Never Surrender]
PAYDAY2 [Criminal's Ambition]
NFS Most Wanted(2005) [Shapeshifter]