Mostly Jessica by Dir En Grey
http://www.youtube.com/watch?v=0DQ7KkOCK8Q

and Kimi Ni Negai Wo by Miyavi
http://www.youtube.com/watch?v=eFX34kMFayw

and Vanilla by Gackt
http://www.youtube.com/watch?v=FNEUNr_n5gY

AND last but certainly not least, Mizerable by Gackt.
http://www.youtube.com/watch?v=Khb7UeGYXEw