It really all comes down to personal taste doesn't it?
But I would have to say:
- Yumi Sugimoto
- Misaki Itoh
- Lee Sun Young
- Carolina 'Pampita' Ardohain
- Laetitia Casta
and of course Aya Ueto who inspired me to start listening to Japanese music
I can't help but post this performance. Lisa Kelly with heavenly voice (0:37 -)
http://www.youtube.com/watch?v=SHzojCDLWw8&feature=PlayList&p=A5C5D1889952A561&index=1