Last one that really stuck in my mind was playing Red Dead Redemption and finally getting into Mexico. Clear skies, sun was setting in the background and a song by Jose Gonzales starts in the background getting louder and louder. Epic.
http://www.youtube.com/watch?v=GHIyutwiJO8
Your turn.
http://www.youtube.com/watch?v=GHIyutwiJO8
Your turn.