Celes's Theme, as heard in the single most emotionally poignant moment in the entire history of gaming. If you've played FF6, and if you've failed the fish minigame at the beginning of the World of Ruin because you wondered what would happen (I won't spoil it for those two or three of you who still don't know), and if you've had to pick your jaw up off the floor and wipe your eyes, and if the sight of that bird on the beach remains the Crowning Moment of Awesome for the entire medium of video games...
Well, yeah. I pick Celes's Theme. No YT link because I'm in the college computer lab and that means no sites with sound.