Z7b2012lp0427arr

z7b2012lp0427arr (called on the JASRAC database) is Disc 2, Track 15 on the XenobladeX Original Soundtrack. It is a remix of no6=LP with heavier percussion. It does not play in Xenoblade Chronicles X.

Etymology
The track title can be split into 3 parts: the prefix 'z7b', the digits '20120427', and the letters 'lparr'. The letters likely signify 'LP Arr'-angement, as the track is a remix of no6=LP. The digits can be interpreted as the date 2012/04/27, or the 27th of April 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. 'z7' is a holdover from this codename.

Therefore, 'z7b2012lp0427arr' decodes into 'The 7th track composed for Xenoblade X, an arrangement of no6=LP, recorded/mixed on the 27th of April 2012'.