A Brewing Storm

A Brewing Storm is Disc 1, Track 25 on the Xenoblade2 Original Soundtrack. It plays in the following cutscenes in the main game of Xenoblade Chronicles 2:
 * Muimui and oversee the production of artificial Blades.
 * Muimui reveals he intended to lure the party to the Abandoned Factory.
 * Senator Roderich oversees the maintenance and excavation of the Titan weapons on Temperantia.
 * Mòrag explains Bana’s planned attack in Indol.
 * The Indoline monks confront the party on the World Tree and order Rex and Mythra to use Siren against Torna.

It also plays in the following cutscenes in Xenoblade Chronicles 2: Torna ~ The Golden Country:
 * Addam is warned about Malos’s plan to attack Auresco. (In the main game flashback of this cutscene, Tensed Mind plays instead.)
 * Malos awakens the Tornan Titan.