A prelude to the tragedy

a prelude to the tragedy is Disc 1, Track 1 on the Xenosaga III: Also Sprach Zarathustra Original Sound Best Tracks album. The melody at 0:07 is used in a memory of a tragedy. The melody at 0:44 is the main melody of mother, I miss you and was used in promised pain and maybe tomorrow~ending medley.

It plays in the opening flashback cutscene, when Kevin's mother sends him away from Michtam as it is being destroyed.