"Dearly Beloved" is the opening song to all Kingdom Hearts series games and is composed by Yoko Shimomura. "Dearly Beloved" is considered the main song of the Kingdom Hearts series and is enjoyed by many fans solely for its ambiance and simplicity.
It appears as soon as the game comes on and plays over the opening Menu Screen in a loop. There is also a Reprise version that plays after the credits at the last screen in Kingdom Hearts and over your Battle Report results in Kingdom Hearts II.
The original version of "Dearly Beloved" was composed solely on the piano and mallets; the Kingdom Hearts II version transformed it a full orchestral piece, even though the piano still remains dominant, with the melody changed.