Prologue A (プロローグ A) is an Event Track in Xenoblade Chronicles, composed and arranged by Yoko Shimomura, with additional arrangement by Tsutomu Narita. It is track 2 of disc 1 from the Xenoblade Original Soundtrack. This music plays in the game's very first cutscenes, during the Battle of Sword Valley as Dunban, Dickson, and Mumkhar regroup to meet the Mechon onslaught, prior to the game's first tutorial battles.