We've got to believe in something 2

 (also referred to as Fragments of Truth #1) is a track in Xenosaga II to III: A Missing Year. It is a version (without the main melody) of we've got to believe in something from the Xenosaga III: Also Sprach Zarathustra Original Sound Best Tracks, along with, , and

It plays when Shion narrates the attack on the Subcommittee's lab in Chapter 1.