Bionis' Interior (Pulse) (巨神胎内／鼓動, Inside the Giant / Pulse) is a Field Track in Xenoblade Chronicles, composed and arranged by Manami Kiyota. It is track 21 of disc 4 from the Xenoblade Original Soundtrack. This music is heard while the party is in the Bionis' Interior after the events at the Mechonis Core, when the Bionis has reawakened and the area is opened up fully.