Z23s20a12m0a9-1r4u

z23s20a12m0a9-1r4u (called on the JASRAC database) is Disc 2, Track 17 on the XenobladeX Original Soundtrack. It is split into two parts: the first plays from the start until 2:19, and the second plays from then until the end.

The first part plays in the following cutscenes:
 * Luxaar discusses the Ganglion's situation on Mira with Goetia at the start of.
 * Ga Jiarg reports to Luxaar at the end of Chapter 6.
 * Ga Jiarg tells Luxaar that the Wrothians will no longer work for the Ganglion in.

The second plays in the following cutscenes:
 * Two BLADE members attempt to rile Irina up during Renewed Will.
 * Ga Jiarg and Ga Buidhe successfully break into the Hangar in.
 * briefs the party on the mission to recover the stolen data terminal in.
 * ST816: Stalio, disguised as a Prone, begs the party for help during Bozé's Ignorance.
 * Lularita requests Hope's assistance in protecting Drongo Caravan during Hope Springs Eternal.
 * Elma airs her thoughts on Chausson's possible true intentions during Prospective Partners.
 * Irina and the party report back to Eleonora at the end of My Dream.
 * Murderess confronts Lan'cord during The Little Rich Girl.
 * Murderess resolves to find NLA's serial killer during Serial Thriller.
 * The party finds the remains of the battlefield at Nagi's last known location during Nagi's Time.
 * Eleonora communicates with an unknown party about J-bodies at the end of Yelv's Partner.

Etymology
The track title can be split into 3 parts: the prefix 'z23', the digits '20120914', and the letters 'sama-ru'. The letters likely reference the Samaarians or the Samaar Federation (the hyphen may be a reference to how a horizontal line indicates a repeated vowel in Japanese). The digits can be interpreted as the date 2012/09/14, or the 14th of September 2012, the date in which the track was recorded or mixed.

The track is one of several in the XenobladeX Original Soundtrack beginning with 'z' and a number (possibly followed by 'b'). The significance of this is that the composer Hiroyuki Sawano gives codenames to tracks before he properly titles them: a letter/abbreviation followed by a number, where the letter/abbreviation corresponds to the soundtrack in question. In the case of Xenoblade Chronicles X, this letter was 'z' (Xenoblade X's Japanese name, ゼノブレイドクロス, can be romanised as Zenobureido Kurosu). The number corresponds to the ordering in which tracks were composed. 'z23' is a holdover from this codename.

Therefore, 'z23s20a12m0a9-1r4u' decodes into 'The 23rd track composed for Xenoblade X, Samaar theme, recorded/mixed on the 14th of September 2012'.