I'd like to put forward
Ace Combat 5: The Unsung War, one soundtrack I find myself going back to time after time, long after the game has faded into distant memory. The strings, brass, and percussion are immaculate throughout - top quality samples, beautifully blended. It's also sympathetically mastered, very much crankable and I experience no listening fatigue even after the four discs in one sitting (despite the fairly tedious arcade section, and the obnoxious Puddle Of Mudd song).
Just a few of the tracks that always bowl me over:
Wardog, Lit Fuse, White Noise, Grabacr, Winter Storm. And the main event
The Unsung War is pretty spine-tingling.