Toellner sprung Final Fantasy first, and I don't want to linger on it, but this song really stuck with me, even after beating the game.

[youtube]QyN7j1al37I[/youtube]

Also, Halo was brought up as well, and while I adore the main theme, I'm partial to a specific track from ODST.

[youtube]IyOezaeH00M[/youtube]