Thoughts with Ziggy

 is a track in Xenosaga Episode II. It has not been released on any soundtrack or sound selection and not much is known about this track. It plays in the following cutscenes:
 * Juli talks with Ziggy about MOMO and Sakura in the U.M.N. Control Center.
 * Juli tells MOMO about her new feelings for her before the party leaves for Old Miltia (Japanese audio only — in the English version of the game, Sakura (theme-piano ver.) plays instead).
 * Juli and Ziggy discuss the prospect of giving the latter life-extension surgery.

Thoughts with Ziggy 2
 is a track in Xenosaga Episode II. It has not been released on any soundtrack or sound selection and not much is known about this track. It is a version of Thoughts with Ziggy with different instrumentation. It plays in the following cutscenes:
 * Kevin and Shion talk about their hopes for KOS-MOS's future (flashback) (Japanese audio only — in the English version of the game, plays instead).
 * Rubedo gives Sakura's message to Juli after the first dive into her mind. (Curiously, the Japanese and English audio play different parts of the track in this cutscene.)