Bastian, Transistor and Max Payne 3.
The OSTs of Transistor and Max Payne 3 are a huge part of why I enjoyed those games. With Max Payne, in particular, the music got me through when the game wouldn't have. It was a brutal, abrasive setting with some of the most disturbing moments I can recall from a game I've played, but the game remains one of my favorites because, to my surprise, that soundtrack was a beautiful, heart-thumping contrast to the story, setting, and gameplay. I didn't realize it was composed by HEALTH until I finished.