* ''Xenosaga I''[='=]s soundtrack was composed by the venerable YasunoriMitsuda:
** ''Xenosaga I''[='=]s [[http://www.youtube.com/watch?v=9_NKJNo7nx8 battle theme]]. Pure orchestral awesome.
** [[http://www.youtube.com/watch?v=y6YBMmmeY1w Breaking Space Ship Pursuit.]]
** [[http://www.youtube.com/watch?v=kzVA4tDyVXk Nephilim.]]
** [[http://www.youtube.com/watch?v=izpN6hWBKIk The Resurrection.]]
** The final boss fight theme, appropriately called [[http://www.youtube.com/watch?v=N3sErgVX25w "Last Battle",]] is surprisingly minimalistic yet incredible.
** The credits theme, [[http://www.youtube.com/watch?v=uAVApcrgFzs Kokoro.]]
* ''Episode II'', whose soundtrack is fairly mediocre overall, still has some of the best songs in the series, particularly those composed by Music/YukiKajiura. [[http://www.youtube.com/watch?v=eTujeWkIhtE Communication Breakdown]], [[http://www.youtube.com/watch?v=UgG5SEHTKgU Fatal Fight]], "Here She Comes", "Battle Of The Elsa", "Chase", "Sakura", "Sweet Song" ... real diamonds in the rough, no question.
* ''Xenosaga Episode III''[='=]s soundtrack by Music/YukiKajiura is nothing short of amazing:
** Special mention must be given to [[http://www.youtube.com/watch?v=eUcxlxhlRvo godsibb]], which is widely regarded to be one of the best songs in the series. Its [[http://www.youtube.com/watch?v=JrBk3oZ2jc0 live performance]] is a SugarWiki/MomentOfAwesome on its own.
** [[http://www.youtube.com/watch?v=8KX9L6YkA78 Abel's Ark]] is also quite beautiful, and slightly unsettling.
** [[http://www.youtube.com/watch?v=QBHlgwAx7GA Lamentation.]]
* The [[http://www.youtube.com/watch?v=CzJ15BSSI9M "Sakura" theme]] in ''Episode II'' and [[http://www.youtube.com/watch?v=dIReESnbO0c "Hepatica" theme]] in ''Episode III'' (arguably the themes for their respective games) are truly awesome. Not in the way to inspire awe and terror, but the way they draw out TenderTears in how ''beautiful'' they are. The song "Testament" from ''Episode III'' can produce similar feelings... Well, at least [[http://www.youtube.com/watch?v=hAF3k7ak55U the beginning part of it.]]
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