Ayumi Hamasaki- just listened to her newest album- Love songs <33
NICO Touches walls- love the voice of vocalist
X Japan- of course

Utada Hikaru- Love her voice *o*
Flow- my first Japanese band
Orange Range
One Ok Rock<-- they are just AWESOME! I can't believe it that they are that young and inexperienced, their songs are great
doa- thanks B'z for them!
There are also many bands that I know very well, but I don't like them much, most of them are Visual Key, I know them because every1 around listens to them so I just hear their songs everyday but I don't enjoy them at all XD