J-Pop Artist Suggestions.

hey guys
i guess i'm new to j-pop!
...
so can you tell me some good j-pop artists you like so i can check 'em out!
oh, and tell me a good song by them too

OTHER THAN THE ONES BELOW:
ayumi hamasaki (duhh...)
koda kumi
ai otsuka
ken hirai
utada hikaru
yui
namie amuro
+ mika nakashima

k.thnks