SeikimaII's Libido (or Seishin no Kuromaku ~Libido), probably played at The Black Mass Final 3 Nights, in late December 1999.

(SeikimaII's a Japanese heavy-metal band, probably one of the first "visaul-kei" bands, though I believe they never claimed this name as they began in 1982, which is looooong before "the visual-kei trend"... they had such a strong look/visual even as they began, with every member taking the role of a "demon/oni": definitely "visual-kei", in the original idea, don't care if most recent visual-kei bands don't sound like that at all!)