Dash de Chocobo (Chocobo Time!) From FFXI: Rise of the Zilart
Every Final Fantasy game has a chocobo song in it. This version is even more catchy and light than the recent PS version of the theme. Whenever you get a Chocobo in this game and ride it, you will hear this music. The music plays for about half the ride of the chocobo event then reverts back to whatever music is in the game. Interestingly enough, this song was released for the expansion pack, (Which came with the North American version of the game).
If you listen to the track, you can hear instruments added every time the theme is played. This might be my favorite version of the Chocobo theme, but FF8's rock version comes close.