La colonna sonora di Kingdom Hearts è composta da due CD venduti in un'unica confezione e contenenti un totale di 76 canzoni.
Ecco il titolo e la durata di ciascuna di esse:

Disco 1:

1. Dearly Beloved (1.13 m.s) [download]
2. HIKARI - KINGDOM Orchestra Instrumental Version - (3.42 m.s) [download]
3. Simple and Clean - PLANITb Remix - (Short Edit) (2.31 m.s)
4. Dive into the Heart - Destati (4.47 m.s) [download]
5. Destiny Islands (1.49 m.s)
6. Bustin' Up on the Beach (2.01 m.s)
7. Mickey Mouse Club March (1.02 m.s)
8. Treasured Memories (1.45 m.s)
9. Strange Whispers (0.55 m.s)
10. Kairi I (1.19 m.s) [download]
11. It Began with a Letter (1.32 m.s)
12. A Walk in Andante (1.18 m.s)
13. Night of Fate (2.06 m.s)
14. Destiny's Force (2.50 m.s)
15. Where is This? (1.42 m.s)
16. Traverse Town (1.21 m.s) [download]
17. The Heartless Has Come (00.54 m.s)
18. Shrouding Dark Cloud (2.15 m.s)
19. Blast Away! - Gummi Ship I - (1.50 m.s) [download]
20. Tricksy Clock (00.38 m.s)
21. Welcome to Wonderland (1.53 m.s) [download]
22. To Our Surprise (2.14 m.s)
23. Having a Wild Time (00.16 m.s)
24. Holy Bananas! (2.08 m.s)
25. Squirming Evil (1.30 m.s)
26. Hand in Hand (2.05 m.s) [download]
27. Kairi II (00.33 m.s)
28. Turning the Key (3.00 m.s)
29. Olympus Coliseum (2.25 m.s.)
30. Road to a Hero (2.16 m.s.)
31. Go for It! (1.54 m.s.) [download]
32. No time to Think (2.26 m.s)
33. Deep Jungle (1.02 m.s) [download]
34. Merlin's Magical House (1.46 m.s)
35. Winnie the Pooh (2.28 m.s.)
36. Bounce-o-rama (1.48 m.s.)
37. Just an Itty Bitty Too Much (00.40 m.s)
38. Once Upon a Time (00.21 m.s)
39. Shipmeisters' Humoresque (2.11 m.s)
40. Precious Stars in the Sky (1.08 m.s)
41. Blast Away! - Gummy Ship II - (1.50 m.s)
Totale 73.34 m.s

Disco 2:

1. A Day in Agrabah (2.23 m.s)
2. Arabian Dream (2.04 m.s)
3. Villains of a Sort (1.32 m.s)
4. A Very Small Wish (2.16 m.s)
5. Monstrous Monstro (1.56 m.s)
6. Friends in My Heart (1.30 m.s)
7. Under the Sea (1.54 m.s) [download]
8. An Adventure in Atlantica (2.03 m.s)
9. A Piece of Peace (1.00 m.s)
10. An Intense Situation (0.48 m.s)
11. The Deep End (2.14 m.s)
12. This is Halloween (2.22 m.s)
13. Spooks of Halloween Town (2.14 m.s) [download]
14. Oopsy-Daisy (00.21 m.s)
15. Captain Hook's Pirate Ship (2.06 m.s)
16. Pirate's Gigue (1.45 m.s)
17. Never Land Sky (1.26 m.s) [download]
18. Kairi III (1.35 m.s)
19. Blast Away! - Gummy Ship III - (1.52 m.s)
20. Hollow Bastion (2.26 m.s) [download]
21. Scherzo di Notte (1.49 m.s) [download]
22. Forze del Male (3.38 m.s)
23. HIKARI - KINGDOM HEARTS Instrumental Version - (1.09 m.s) [download]
24. Miracle (00.16 m.s)
25. End of the World (3.14 m.s)
26. Fragments of Sorrow (2.18 m.s)
27. Guardando nel Buio (4.24 m.s) [download]
28. Beyond the Door (1.08 m.s)
29. Always in my Mind (1.47 m.s)
30. Simple and Clean (5.03 m.s)
31. March Caprice for Piano and Orchestra (5.13 m.s)
32. Hand in Hand - Reprise - (0.55 m.s) [download]
33. Dearly Beloved - Reprise - (1.20 m.s) [download]
Bonus Tracks:
34. Having a Wild Time - Previous Version - (1.11 m.s)
35. Destati (2.55 m.s) [download]
Totale 72.06 m.s

La maggior parte delle melodie è stata composta e arrangiata da Yoko Shimomura, già autrice dei fantastici temi musicali di "Front Mission" e "Legend of Mana". Ecco le eccezioni:

¤ HIKARI (Disc 1 - 02)
Scritta da Utada Hikaru
¤ Simple and Clean (Disc 1 - 03 / Disc 2 - 30)
Scritta da Utada Hikaru
¤ Mickey Mouse Club March (Disc 1 - 07)
Parole e musica: Jimmie Dodd
¤ Winnie the Pooh (Disc 1 - 35)
Parole e musica: Richard M. Sherman e Robert B. Sherman
¤ Once Upon a Time (Disc 1 - 38)
Parole e musica: Richard M. Sherman e Robert B. Sherman
Contiene anche il componimento musicale della canzone Winnie the Pooh
¤ Under the Sea (Disc 2 - 07)
Parole: Howard Ashman
Musica: Alan Menken
¤ This is Halloween (Disc 2 - 12)
Parole e musica: Danny Elfman

Inoltre, Yoko Shimomura ha arrangiato tutte le melodie con l'aiuto di Ryo Yamazaki (programmatore Sintetizzatori), Hitoshi Ohori (programmatore Suono) e Satoshi Akamatsu (programmatore Strumenti), ad eccezione di:

¤ HIKARI - KINGDOM Orchestra Instrumental Version (Disc 1 - 02)
¤ March Caprice for Piano and Orchestra (Disc 2 - 31)
Arrangiamenti Orchestra: Kaoru Wada
Orchestra: New Japan Philharmonic
Ingegnere Registrazione: Takeshi Sakurai
Direttore Registrazione: Tomoko Noda
Sala Registrazione: Sumida Hall
¤ Simple and Clean - PLANITb Remix - (Short Edit) (Disc 1 - 03)
Produzione e remixaggio: Russell McNamara per UnderCover Inc.
Sala di Remixaggio: PLANITb Studios London, Inghilterra
¤ Simple and Clean (Disc 2 - 30)
Produttori: Miyake Akira, Utada Hikaru e Utada Skingg Teruzane
Arrangiamenti: Kawano Kei e Utada Hikaru
Tastiere e Programmazione: Kawano Kei
Programmazione di Base: Utada Hikaru
Programmatore Sintetizzatori: Tsunemi Kazuhide
Chitarre Acustiche: Akiyama Hironori
Voce: Utada Hikaru
Registrazione: Ugajin Masaaki nel Bunkamura Studio, Tokyo
Mixaggio: Goh Hotoda nel Bunkamura Studio, Tokyo
¤ Hand in Hand - Reprise (Disc 2 - 32)
Arrangiamento: Takahito Eguchi
¤ Destati (Disc 2 - 35)
Cori: Tokyo Philharmonic Chorus
Ingegnere di Registrazione: Toshiyuki Yoshida

Kingdom Hearts Original Soundtrack:

Sound Producer: Yoko Shimomura for SQUARE SOUNDS
Production Manager: Kensuke Matsushita for SQUARE SOUNDS
Production Coordinator: Masako Miyoshi for SQUARE SOUNDS
Project Coordinators: Tae Abe for Walt Disney Records and Nobuhiro Shimizu for Disney Interactive Japan
A & R Director: Hidenobu Okita for Toshiba EMI
Executive Producers: Akira Miyake for Toshiba EMI, Akitoshi Nakata for Walt Disney Records and Shuji Utsumi for Disney Interactive Japan
Mastering: Yasman for Bernie Grundman Mastering
Illustration: Tetsuya Nomura and Fumi Nakashima for SQUARE
Sleeve Design: Mitsuhiko Chigira for ELECTRIC
Art Coordinator: Koji Kuroda for Kaitakusha


Titolo: KINGDOM HEARTS FINAL MIX
Brani: 4
CD: 1

01. One Winged Angel
02. Night on Bald Mountain
03. Disappeared
04. Another Side


Titolo: KINGDOM HEARTS COLORS
Brani: 3
CD: 1

01. Hikari ~ Simple and Clean [English]
02. Hikari ~ Simple and Clean [English] [PLANITb Remix]
03. Colors [Karaoke]


I testi degli unici due brani cantati:

Simple and Clean

* When you walk away
you don't hear me say please
oh baby, don't go
simple and clean is the way that you're making me feel tonight
it's hard to let it go

You're giving me too many things
lately you're all I need
you smiled at me and said,

Don't get me wrong I love you
but does that mean I have to meet your father?
When we are older you'll understand
what I meant when I said "No,
I don't think life is quite simple"

repeat *

The daily things that keep us all busy
are confusing me
that's when you came to me and said,

Wish I could prove I love you
but does that mean I have to walk on water?
When we are older you'll understand
it's enough when I say so
and maybe some things are that simple

repeat *

**Hold me
whatever lies beyond this morning
is a little later on
regardless of warnings the future doesn't scare me at all
nothing's like before

repeat *
repeat **
repeat **

Simple and Clean - PLANITb Remix - (Short Edit)

You're giving me too many things
lately you're all I need
you smiled at me and said,

Don't get me wrong I love you
but does that mean I have to meet your father?
When we are older you'll understand
what I meant when I said "No,
I don't think life is quite that simple"

When you walk away
you don't hear me say please
oh baby, don't go
simple and clean is the way that you're making me feel tonight
it's hard to let it go

* Hold me
whatever lies beyond this morning
is a little later on
regardless of warnings the future doesn't scare me at all
nothing's like before

* repeat

Suoneria "Simple and Clean" per cellulari Nokia:

8g1 4d2 8c2 16#a1 8a1 4#a1 8g1 4d2 8c2 16#a1 8a1 4#a1 8g1 4d2 8c2 16#a1
8a1 4#a1 8f1 8f1 8f1 8f1 8#a1 8a1 8#a1 8#d2 8d2 8#a1 4a1 8#a1 8f2 8#d2
8d2 8c2 16c2 8d2 8#d2 4d2 8g1 2#a1 4d2 16#d2 8c2 8.#a1 8a1 [Tempo: 100]