There is no better way to open than with a theme. There is also no better theme with which to open than the aptly named, Opening Theme. In simple terms, Opening Theme appears to be a theme with which one could, conceivably, open a thing. Ideally, this thing would become manifest as a game. Give it a listen as you read, won't you?
The theme opens with a calm tune, not happy, not sorrowful. Maybe a little wistful, but at the same time, home. It swells slightly and the desire for adventure flares for a moment, but it quickly returns to a calm, wistful tune. It goes to remind of adventure to be had, people to be met, places to go, and worlds unseen, but not to be found. Then it leaves an open, empty space to be filled with forbidden adventures, or perhaps a threatening expanse of nothing profound lest one break custom and seek fortune beyond.