Whiterun theme (unforgivably absent from the OST albums)
Fields of Ard Skellig (a version of the folk song “Fear a Bhata”)
From Skyrim… hard to pick out favourites
From Supreme Commander: Forged Alliance (Jeremy Soule again): The Art of War. It opens boldly but there’s a moment when it’s just twinkling in the strings, percussion and a little piano with almost no melody. If at that moment you happen to be watching the trajectory of your artillery arcing towards the enemy, and then the theme comes back as they land… sublime.
I couldn’t pick just one.