There's so much great music in the game that it's hard to really narrow it down, but I'm actually going to go with a couple recent tracks:
1.) One Small Step
As a huge FF4 fan, when I originally heard we were going to the moon, I started dreaming of a Soken version of the moon theme from FF4 (and I do still hope we get that in some way/form) and this is very much not that. But One Small Step is a such a perfect piece to really capture the feeling of being alone out there in the stark light under the black star filled sky. It's really very meditative and then the echoes of the Crytal Theme come in. Damn. I will say that as good as a lot of Soken's songs are (and FF songs are in general), I do get bored of them fairly quickly, but this is one song I can (and have) literally listened to on repeat for hours on end.
2.) Echoes in the Distance / Close in the Distance (Instrumental)
I know there's a lot of debate around whether or not the vocal version should play in the zone after you finish the story, and I tend to lean towards that it should be the instrumental version, but I appreciate them all. I will say that hearing the Echoes version upon first arriving there was something of a revelation. Again, just like One Small Step, it really fit the moment and area perfectly. I loved how the song built in layers are you progressed through the zone. That was such a magnificent touch. And I'll also say that hearing the Vocal version has actually given me even more of an appreciation of the non-vocal versions. They are multiple different songs but really do somehow exist in my mind as the same song.
