Sergius & Margulis

 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:
 * Margulis tells Sergius about MOMO having reached Second Miltia.
 * Sergius addresses the Galactic Federation regarding the (Japanese audio only — in the English version of the game, here he comes plays instead).
 * Margulis addresses Sergius after the path to Old Miltia is opened (Japanese audio only — in the English version of the game, here he comes plays instead).
 * Margulis tells Sergius that U-TIC only serves Heinlein after the awakening of Proto Omega. (Curiously, the Japanese and English audio play different parts of the track in this cutscene.)