Phaaze is the the theme that plays on the planet of the same name in Metroid Prime 3: Corruption. It is highly dissonant in tone and a remix of the Phazon Area theme from Metroid Prime. Another remix of that song in Metroid Prime 3: Corruption is featured in each Leviathan. The original song is also heard in Corrupted Pool and the Leviathan Battleship.
It can be heard here: .