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The subject of this article is not named in-game.
The current title is from the game's internal data.
Heion2 (as named internally) is a brooding ambience theme in Metroid Prime 3: Corruption.
It plays in rooms in the game where there are no enemies or no immediate threat, such as in the Ready Room prior to Fleet Admiral Castor Dane's briefing, the Falls of Fire in Bryyo Cliffside, or rooms on the Pirate Homeworld during Samus's first visit, prior to her detection by the Space Pirates. After the Pirates become fully aware of her presence, the theme is replaced by a remix of Crateria - The Space Pirates Appear from Super Metroid in the Command Center and the Mining Site, but not in the Research Facility.
It should be noted that "heion" is Japanese for "peaceful". It is one of two "heion" themes, with the other being "Heion1".
The theme can be heard here.