Best them tune

[Tabris]

Yuna's theme is the beach theme.

Do you mean the song played when you walk around Besaid Island? Could you please let me know your resources on that statement?

Edit: You can hear Yuna's Theme at the end of Luca, just before the "laughter scene" between Yuna and Tidus. It plays when Yuna is talking about summoner's being Spira's ray of light.