Here's one from electronic music artist, Disasterpeace. He is probably best known for his work on Fez, a video game for which he composed the soundtrack. These two pieces are quite different from the rest of the soundtrack, utilizing more percussive elements and building in a way that departs from the more ambient sounds present within the entire work. Not to say that the soundtrack isn't solid. On the contrary, the pieces within the soundtrack all compliment each other wonderfully, but these two stand out, and for a good reason. The progressive building within the arrangement and meticulous production are what set these songs apart the most in my opinion, both of which match up quite well within the context of the game itself.
Got any favorite soundtracks?