|This article is written from the Real Life point of view|
Helios is the battle theme of the boss of the same name in Metroid Prime 3: Corruption. It is one of the songs that can be purchased in the game's Soundtrack Gallery. On the UK Corruption website, it is known as Track_13 in the music player.
This orchestrated theme is comprised mostly of strings and light electronic percussion. Its chromatic progressions, harp arpeggios, and dissonant tone emphasize the mysterious nature of the boss himself.
It can be heard here: .