Utada Hikaru.
Namie Amruo...
She is know and queen of Japanese Pop
It is difficult for me to find some interesting Japanese artists that are not labeled "J Pop".
Nevertheless, I have a crush on Shiina Ringo and particularly her group called Tokyo Jihen.
This band makes some good music with a great female singer truly talented.
福山雅治
いきものがかり
AKB48
徳永英明
Yamashita Tomohisa