Quote Originally Posted by ChaosCalibur
But in general KH has the best, i forgot it's name, but it's in the levels "Awakening" and "Final Rest" In other words, the first and last levels... It's just so beautiful
That sounds like variations of the Destati theme. There's at least these variations in the game:

"Dive into the Heart - Destati" (when you walk around in the opening dream sequence and fight Darkside)
"End of the World" (shouldn't be hard to guess where this plays )
"Fragments of Sorrow" (the battle theme in End of the World)
"Guardando nel Buio" (the battle against (SPOILER)Ansem's huge form, the World of Chaos)

They're all pretty excellent. The actual song Destati only plays in various KH trailers, and it's also in the soundtrack.