Providing a number of background themes that I've used!
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End: From Autumn to Ashes - Short Stories with Tragic Endings
End vs Astrynax, Round 2: Chop Suey - System of a Down
Astrynax: Falcoulner - Piccolo Theme
Astrynax vs Shiranai: Disturbed - Stupify
Retri: Cube - Cube background theme
Stephen: Linkin Park - With You
Okan: Foo Fighters - My Hero
Modica: Falcoulner - Mysterious Person [Shin]
Shadow of Astrynax: Marilyn Manson - Sweet Dreams (Are Made Of This)
Shadow of Astrynax: Final Battle - Secret of Mana: Meridian Dance
The Creature: Hoobastank - Crawling in the Dark
Infinity Corporation: Marilyn Manson - Resident Evil Movie Theme
Kaidosia/Knossos Planet: Phantasy Star Online - Mother earth of dishonesty 1 [Forest]
Peaceful Times: AIR -