For those who have not completed games in the Xenoblade Chronicles series, this page contains spoilers regarding the plot. Discretion is advised.
no1=CODENAMEZ is a track in Xenoblade Chronicles X, composed and arranged by Hiroyuki Sawano. It is track one of disc one from the XenobladeX Original Soundtrack, and the first part of the suite titled 0rCH-SUITE "X". It also appears on the soundtrack drive included in the game's North American special edition.
This is an orchestral song which plays during the Ganglion invasion on New Los Angeles, when the Ganglion mothership appears and enters the city. It later plays in the cutscene where the party encounters the Zu Pharg.
The game's soundtrack features several vocal renditions of this song: