Wow, that's not an easy question to answer. I reckon games have way better soundtracks than movies so there are alot of good ones to choose from.
The Morrowind title is obviously one piece that comes to mind but honestly, I'm gonna have to say that I enjoy
From Past to Present from the Skyrim soundtrack more. It gives me a soothing feel like like no other soundtrack.
I also remember in 2009 when Assassin's Creed 2 came out. For me, that was the most anticipated game of the year and I remember how I pretty much spent an entire weekend playing it when it first came out. Whenever I hear
this soundtrack I immediately think back to those times.