For those who have not completed games in the Xenoblade Chronicles series, this page contains spoilers regarding the plot. Discretion is advised.
Mechanical Rhythm (機の律動) is a Field Track in Xenoblade Chronicles, composed and arranged by ACE+. It is track 15 of disc 4 from the Xenoblade Original Soundtrack. This music is heard whenever the party engages an enemy in battle in the Mechonis areas of the game (except for Sword Valley): Galahad Fortress, Fallen Arm, Mechonis Field, Central Factory, and Agniratha. Notably, this same theme plays when Junks flies the party into the Central Factory to pursue Egil after the destruction of Agniratha.
A shortened version of this song appears in Super Smash Bros. for Nintendo 3DS / Wii U (both versions). It is unknown as to why certain parts of the song have been trimmed.
The Live Recording is an official live performance of five songs from Xenoblade Chronicles to celebrate the release of Xenoblade Chronicles 3D. These songs were performed and orchestrated by ACE+ band accompanied by a string quartet, in particular the live recording of "Mechanical Rhythm".