I played 1.0 for a grand total of like, three hours, but the La Noscea theme, "
On Windy Meadows", was really pleasant to listen to. It shows what seems to have been a strong Andean musical influence that Uematsu must have been feeling at the time, judging by a similar feel in his work on Lost Odyssey (such as
here). It's just such a great chillout piece. I was pleasantly surprised to hear some riffs from it crop up in the music in Aleport and Moraby Drydocks.
I also really like how "Twilight Over Thanalan" got worked into scenes during story quests if you start your ARR character in Ul'dah. It definitely feels more appropriate as an accompaniment to characters waxing poetic in cutscenes than for environmental exploration and travel (for which "To the Sun" is just fantastic)