This girl is so amazing, she has so much talent and her english is perfect! It's better then even most nautral english singers. If you dont believe me, find Danielle and Afternoon Repose. Danielle just because it is such an awesome song and Afternoon Repose because you can hear say 'L' and 'R' words perfectly. You wouldn't know she was Japanese unless someone told you.
Hiroko Kasahara
Mai Kuraki
Aya Ueto
Kahala Tomomi
SES
Jang NaRa (I want her bad!)
Berryz Koubou
Morning Musume
W (Double You)