Bonds of Sea and Fire is easily my favorite track in the game and I tend to listen to it when I need to relax and center myself. It's just a peaceful track.

Light from the Netherworld is an awesome track and one of my favorite opening themes in a video game.

The First and the Last is often overlooked but I really love all vocal tracks and it's a pretty amazing piece to have during the ending.

I will second the Shattering Egg of Dreams as I really like the more melancholic tracks in this game.

Though a Distant Promise is another huge favorite but I am a sucker for music box themes.