I know where Ozma is from, but the Demi-Ozma mount of FFXIV is clearly intended as a memento of the Baldesion Arsenal experience.
Whenever you mount it, you can see the Arsenal before it turns into Ozma proper, and also whenever you fly or dive underwater.

That being said, I would be more than happy with FFIX music, and it would obviously fit well.
Just anything but the default flying tune that plays for everything would be great.