Endzville: Oh, I love lots of soundtracks to games. Some of my friends find it funny that the music folder on my phone is filled with them. That said, here's a bunch of great ones that I listen to more often than others:
Amnesia: A Machine For Pigs (first game's soundtrack isn't something I care much for outside of the game, but I love this one's)
Awesomenauts
Bastion (blew me away in game - absolutely stunning)
Bioshock Infinite
BIT.TRIP.RUNNER (it's a music rhythm game, so go figure)
Chrono Trigger
Dear Esther
Deus Ex (yes yes yes)
Deus Ex: Human Revolution (*gasp* it's just as good)
Far Cry 3 (not perfect, but pretty good)
Far Cry 3 Blood Dragon (kicks ass)
Faster Than Light
Fez
The Last of Us (don't even own the game yet, but the soundtrack's one of my favourite of all time for anything)
Half Life 2
Hotline Miami (like TLOU, one of my favourite soundtracks ever)
Lone Survivor
Killer 7
Kentucky Route Zero (assuming the remaining acts will make use of music so well too)
Superbrothers: Sword & Sworcery
Shoot Many Robots (can't remember how I got this as I haven't even got the game, though I love this)
The Swapper
Oddly, I don't go out of my way to pick up AAA game soundtracks, even though there's a ton of great ones there too. But, yeah, there's those. Could look through my Steam or GOG library too, for some other favourites, but I guess that makes my point: I love music for most games I play.
I love Blood Dragon's OST, never played the game but I love the 70's feel, the awesome synth, it's all great haha. Wasn't much into Hotline Miami's or FTL's but I forgot to mention 2 of my absolute favorites (other than the ones previously mentioned) Gunpoint's and LA Noire's OST are amazing, probably my top 2 sound tracks (other than Skyrim) no joke.