From Bara no Seido (2000 - 2001) comes Beast of Blood,, this is the Klaha era when they abandoned the lighter pop music sound of the Gackt era for a more dramatic mixture of classical music, gothic/goth and heavy metal music, and adopted an elaborate funeral Goth look.
This is track number 7 from the Rebirth album by Gackt.
This is track number 4 from the Crescent album by Gackt