The music for "End of the World" is another mix of "Destati", complete with chimes, strings, and vague chanting in the background...or just vocalizations. There's a bit of vibraphone in there too. The effect is both beautiful and nightmare-inducing.
"Another Side". Plays in the Final Mix secret ending trailer, and it spawned "Organization XIII", "Graceful Assassin", and "Showdown at Hollow Bastion". A remix of the whole track was used in 358/2 Days, and the actual track was used in Aqua's battle against Braig in Birth By Sleep.
The adventurous "Deep Jungle" theme that plays in Tarzan's world.
"Memories in Pieces", the opening theme which has bits from "Hand in Hand", a chilling version of "Scent of Silence", Naminé's beautiful theme, and then the ominously awesome "Castle Oblivion".
"Naminé's Theme". Much like Kairi's Theme, it's so beautiful. It also uses something similar to "Prelude" as a background tune.
The Re:Chain of Memories version of "Sinister Sundown", for your daily dose of great fight music. And it's a good thing it's so good, because you hear its Kingdom Hearts II incarnation a lot in Days...
"Nightof Fate",full stop. This song is the battle theme of Destiny Islands and acts as a musical accompaniment for Sora's sadness, confusion, and drive against the Heartless until he comes to understand himself and his power....on the night when all this happened, no less. Creative name.
"Fate of the Unknown", which plays during the extended secret ending in the Final Mix. "Sunset Horizons", the wonderfully ominous song that plays during the original secret ending serves as its precursor.
Running down the Ravine Trail to avenge a boulder-beaned Goofy to "Vim and Vigor" is also epic. When combined with the pairing-up with Final Fantasy characters, it becomes an all-around Crowning X of Awesome.
"Hazardous Highway", a rockin' piece of Gummi Ship music. The two levels that feature it were already reminiscent of Sonic games, but the music clinches it.
The Gummi Ship themes are all surprisingly peaceful or upbeat, and the levels are kind of goofy, really. Well... all of them but the Star Wars-ish last one, with dreadnoughts of doom blasting the hell out of you, and its epic theme called "Battleship Bravery".
You want a kickass battle theme? Try "The Encounter"! The best part is that it plays mostly during Disney villain boss fights, so you get a good background song for your Catharsis Factor.
"Sora's Theme". Sure, it sounds all light and airy, because Sora's so happy all the time, but underneath it you can hear this steady, driving beat. Not only does it remind you of a heart, but it also shows his sheer determination to find his friends and generally win. It sends shivers down the spine.
"Working Together". It has such a happy beat to be a battle song, instead making you feel like you want to dance.
Then there's "Critical Drive", one of the final battle themes in the game. While the KH2 version, "Deep Drive", was all right, the 358/2 Days version really brings out Roxas's and the player's drive to beat the mission.
The Kingdom Hearts 358/2 Days "Sacred Moon" remix named "Mystic Moon", heard as Roxas escapes the castle. While neither truly original, nor action packed, it communicates tension, fear, and uncertainty in Roxas' leaving of the Organization.
The opening song, "Sanctuary". While it made its first appearance in Kingdom Hearts II, the lyrics really fit with the Nobodies, especially Roxas.
"Fight and Away" is a fantastic remix of the two boss themes, Struggle Away and Fight for my Friends, from Chain of Memories and makes any fight ten times more epic.
The very melancholic yet beautiful "Missing You", debuts in Kingdom Hearts II but fits the theme and sadness in Days much better.
The winner for the most unexpected piece of music to ever come out of the Kingdom Hearts series: "A Date With Fate", a bouncy remix of "Succession (Theme of Crisis Core)" that plays during scenes with Zack.
The Unversed Boss music, particularly "Unforgettable", is fun, as well as giving huge hints that the Unversed come from Vanitas due to the similarity of the themes.
"Dismiss", the Final Boss theme, takes the already awesome "Fragments of Sorrow", mixes it with Terra's theme, and turns the whole thing Up to Eleven, bringing out both a feeling of foreshadowing and tragedy as Aqua has to defeat her possessed former friend.
"Makaukau", the Deep Space battle music. It's pretty much hardcore techno.
These two remixes of "Scherzo Di Notte" and "Radiant Garden", which take the already great original songs and adds a touch of grandiosity fitting for Birth by Sleep's version of the world. And it's even more awesome when you realize this is a song of Radiant Garden a.k.a. Hollow Bastion in its glory before Xehanort ruined it and Maleficent took it over.
"The Tumbling", otherwise known as the Wheel Master battle. Fans were rearranging and remixing this track almost immediately after it was revealed in an early gameplay trailer.
"Rage Awakened -The Origin-". For all the awesomeness from KHII, it's even better here. It has a sense of urgency that fits the tone of the fight that KHII didn't have. The song makes that scene.
"Terra's Theme" isn't bad either and befit Terra's resolve and will. It is also similar to "Rage Awakened" since both songs are affiliated with Terra, either as himself or as the Lingering Sentiment/Will.
Considering that Sleeping Beauty had a soundtrack entirely comprising classical music, it's no surprise that the world based on it has fittingly great music. Having said that, listen to "The Rustling Forest", the battle theme of Enchanted Dominion, and try not to go deaf from how awesome it is.
Impossible as it may seem, the Ice Cream Beat mini-game actually managed to come up with a version of "It's A Small World" that's not only not-cringe-inducing, but actually pretty good! (it helps that the thing that makes the original so ear-grating—the singing—is absent).
From the game's Final Mix we have "Master, Tell Me The Truth", the battle theme for The Armor of The Master, Master Eraqus' Sentiment, which incorporates some of the Land of Departure's battle theme.
Also from the Final Mix, "Forze dell'Oscurita", which is the battle theme of No Heart, Master Xehanort's Sentiment. It epically combines "Forze del Male" with "Darkness of the Unknown" for music of sheer power.
The version of "The Encounter" used in Birth By Sleep may be superior to the original! And it gets used in an awesome way in 3D when it plays during the JuliusBonus Boss fight.
The haunting "Sunset Horizons" that plays in the Keyblade Graveyard really gets across the tragedy of what has and will transpire in that place. It doesn't matter that you just spent 30-40ish hours playing as these characters. THEY. WILL. LOSE.
Interestingly, it has some of Aqua's Theme laced into it, hinting that she is the only one to truly survive the encounter with Xehanort and Vanitas here.
"Eternal Moments", an extraordinary remake of 358/2's "At Dusk, I Will Think of You" that plays when Ventus gets to first meet Lea and Isa in Radiant Garden.
As the tradition goes, a new and amazing version of Dearly Beloved just as beautiful as all the others. Especially when it's played when Sora and Riku save Mickey in Symphony of Sorcery.
Xigbar's own leitmotif, debuting in this game. It's the Organization XIII theme, only with a faster rhythm - a waltz, to be correct - and a creepy violin theme playing underneath. This is meant to invoke an unpleasant effectnote the same effect as, for example, The Third Day in Clock Town; and while it'd be spoileriffic to say why, this theme fits Xigbar and Braig perfectly, summing up his prominent role in the formation of the rest of the Organization.
Link to All is very upbeat theme that very well emphasizes Sora's ability to link so many hearts.
"UNTAMABLE", the most recurring Dream Eater boss themes, gives off a fun fair vibe, inviting you to enjoy the fight, while being fairly epic! This is in contrast to a good part of the other KH boss themes which are usually ominous and foreboding, while being epic.
Ice-Hot Lobster, like many Dream Eater boss themes, invites you to just enjoy the fight and have fun!
Gigabyte Mantis gives a techno feel to the usual Dream Eater music, and works you up to excitement as you battle the boss!
While Chernabog kept "Night On Bald Mountain" as his boss theme in the international and Final Mix of Kingdom Hearts, Some argue that the version used is pretty much inferior to the original. Thankfully, 3D remade it into something much more awesome to listen too, and it makes the fight ten times more epic!
"All For One", Country of the Musketeers' battle theme, is very energetic and cheery. The playful and peppy runs are what really sell the piece.
"One For All", its field theme, is similarly energetic and cheery, but in a way more fitting of running around and exploring, rather than battling.
"L'Oscurita dell'Ignoto" is a truly amazing rearrangement of Darkness of the Unknown. The violin gives off a very ominous, urgent vibe which really suits the fact that it plays during the fight that shatters Sora's heart.
There's also "L'Eminenza Oscura", the new battle theme of Ansem, Seeker of Darkness. Interestingly, it's what's missing from the song that makes it creepier than previous remixes. It starts off much like the first game's final boss theme, but then shifts into part of "Dismiss", the song from Aqua's fight with Terranort. Except Terra's Theme is missing from this part of the song. There is also the second part of the song which plays during Ansem's second phase. With extra emphasis on the "Dismiss" part of the song.
"The Nightmare" and "The Dream". When the former comes up, you know that something bad is going to happen, and the latter is a soothing playful melody that calms your soul.
The theme associated with Roxas, the Other Promise, also gained its own orchestral version. Most of the song is spent building up, but the final climax brings both chills to the spine and a tear to the eye.
There's also "Twinkle Twinkle Holidays", an orchestration of the theme used in Christmas Town. While not epic in the same way as the others listed here, it is still worth mentioning.
What takes the cake, though, is the masterpiece known as "The 13th Anthology". Yoko Shimomura took every single track within the games that had used Another Side's central theme (and The Encounter), and worked them together into one goosebump-inducing song.
Piano Collections Kingdom Hearts and Piano Collections Kingdom Hearts Field & Battle
The "Concert Paraphrase on Dearly Beloved", which is probably the greatest "Dearly Beloved" piano arrangement that exists. This version's epicness comes from the feeling of climbing stairs as you listen to it. With the simple, standard Dearly Beloved at the beginning of the album, this awesome piece bookends the album with a virtuoso presentation of a fairly simple melody.
Darkness of the Unknown--Piano Improvisation by Kiwii216 (who has done other Kingdom Hearts piano remixes) is a serene yet sharp interpretation of the original that manages to capture the style of Kingdom Hearts despite its differences.