Z29ba2t0t1l301e17

z29ba2t0t1l301e17 (called on the JASRAC database) is Disc 2, Track 12 on the XenobladeX Original Soundtrack. It is the battle music for Ganglion, Gularth and Sylooth if the party are aboard their Skells when the battle is initiated.

The song was sung by Hiroyuki Sawano. Official lyrics were never released; the following is an unofficial transcription from Wolf Tamer on YouTube.

Lyrics (unofficial)
You and I dancing in the fire And the rest in down in the beat while the fire jumps around us And just swallows

(yea-yea-yeah) So good My love

I can't change the cruel one mistake (break it world) I can't change the cruel one mistake (oh baby) I've been made a fool, it's all my fault (everybody) If I am a fool, it's on myself

Yeah, bring it your worst Celebrate, round and round Stay jolly, round the fire baby Ground solid, I don't celebrate

Tear me away, tear me away I will wa-a-alk a-alone Tear me away, let me go Turn me around

Break it out and fight the war Tear it out and wash the floor Break it out and fight the war Tear it out and wash the floor

Etymology
The track title can be split into 3 parts: the prefix 'z29', the digits '20130117', and the letters 'battle'. The significance of the letters is obvious; the digits can be interpreted as the date 2013/01/17, or the 17th of January 2013, 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. 'z29' is a holdover from this codename.

Therefore, 'z29ba2t0t1l301e17' decodes into 'The 29th track composed for Xenoblade X, battle theme, recorded/mixed on the 17th of January 2013'.