Dearly Beloved

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 loved 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; the Kingdom Hearts II version transformed it a full orchestral piece, even though the piano still remains dominant.

It has appeared in the other Kingdom Hearts games as well, including Kingdom Hearts: Chain of Memories, which was a remix of Dearly Beloved which included slightly different note pitch changes, and another remixed version for Kingdom Hearts 358/2 Days.

Dearly Beloved Arrangement
This arrangement might not be the original sheet music composed by Yoko Shimomura but it is very accurate and most likely what the sheet music is.

Trivia
If you continue to listen to Dearly Beloved without pressing any of the buttons on your controller for approximately 10-15 seconds, the screen will open up the Opening Menu Cinematic, which will play the Kingdom Hearts theme song in an orchestral version.