|This article is written from the Real Life point of view|
Ing Battle is a theme from Metroid Prime 2: Echoes.
Ing Battle plays during battles against the Ing, but does not necessarily play during every encounter. It is also used for the Dark Alpha Splinter, Jump, Boost, Spider and Power Bomb Guardian battles. It also plays during cutscenes that involve the Ing in some manner, such as Samus's first encounter with them (where it is part of a medley), while viewing the final report of GFMC Task Force Herakles, and as Samus is escaping Dark Aether in the ending.
Appropriately for the Ings' dark nature, it is performed with metallic percussive rhythms with slight static and given a more tense and somber tone in its vocalizations.
The theme can be heard here.