Xenosaga III: Also Sprach Zarathustra Original Sound Best Tracks

Xenosaga III: Also Sprach Zarathustra Original Sound Best Tracks is the only official release of the soundtrack of Xenosaga Episode III - Also Sprach Zarathustra, released on 2 CDs in 2006. All tracks were composed by Yuki Kajiura. The album contains only a small portion of the full soundtrack — the sound producer Keiichi Nozaki requested Kajiura to choose 2 discs' worth of tracks, as the full OST would've needed 6 discs to fit all of the music.

The ordering of tracks does not seem to correspond to any ordering in which the tracks may play in-game; it is possible that Kajiura simply chose an ordering which she believed to constitute a good listening experience.

The soundtrack comes with a booklet featuring a track listing, a list of performing musicians, official artwork of the main playable cast, in-game screenshots of various areas, album notes from Keiichi Nozaki, the producer Tomohiro Hagiwara, and Tetsuya Takahashi, lyrics to maybe tomorrow~ending medley, and credits. The soundtrack's outer case, the front of the booklet, and both discs feature artwork of KOS-MOS ver. 4.

Disc 1

 * 1) a prelude to the tragedy
 * 2) fallout
 * 3) we've got to believe in something
 * 4) a dark omen
 * 5) forgotten sanctuary
 * 6) creeping into
 * 7) the battle of your soul
 * 8) rolling down the U.M.N.
 * 9) in a limestone cave
 * 10) inferno
 * 11) on our ways
 * 12) a new world
 * 13) T-elos
 * 14) the Miltia incidents
 * 15) Febronia
 * 16) promised pain
 * 17) mother, I miss you
 * 18) fate
 * 19) Zarathustra dungeon
 * 20) shifting territories
 * 21) hepatica#2
 * 22) the harsh truth
 * 23) to the last place

Disc 2

 * 1) hepatica (KOS-MOS)
 * 2) battleland
 * 3) a memory of a tragedy
 * 4) testament
 * 5) survive
 * 6) T-elos#2
 * 7) she's coming back
 * 8) when the grief lets you go
 * 9) godsibb
 * 10) Febronia#2
 * 11) crisis coming
 * 12) a new world#2
 * 13) outrageous
 * 14) I love you, sincerely
 * 15) hepatica#3~I believe in you
 * 16) maybe tomorrow~ending medley
 * 1) maybe tomorrow~ending medley