You Will Recall Our Names

You Will Recall Our Names is Disc 3, Track 2 on the Xenoblade2 Original Soundtrack. Its name is a reference to You Will Know Our Names. It plays during Unique Monster battles in the following regions of Xenoblade Chronicles 2:
 * Mor Ardain
 * Leftheria (including the Spirit Crucible Elpys)
 * Temperantia
 * Tantal
 * Cliffs of Morytha
 * Land of Morytha
 * World Tree

Similarly, it plays during Unique Monster battles in Gormott in Xenoblade Chronicles 2: Torna ~ The Golden Country. It also plays for the following scripted battles, as well as the cutscenes immediately prior:
 * Malos and Akhos at the Olethro Ruins, for the second phase of the fight (after Mythra's awakening).
 * Patroka and Mikhail in the Abandoned Factory, for the second phase of the fight (after Mòrag joins the party).
 * Jin in Temperantia.
 * Malos and Jin at the Cliffs of Morytha, for the second phase of the fight (after Pneuma's awakening).
 * The Volffs attacking Theosoir in Godfrey's Blade Quest, Flames of Justice.
 * The Vacillus Antol in Nim's Blade Quest, A Phonex Tale.
 * The first fight with Praxis and Theory in their first Blade Quest, Crystal Clear.
 * The Gluttonous Pterix in Vale's Blade Quest, The Ties That Bind.
 * The Ravenous Arachno in the same quest.

Finally, it plays immediately after the fight against the Aurora and Aura Garluses in Corvin's Blade Quest, Corvin's Approach.