I like Ayu (it's a obvious cause I'm here in AHS
)
Otsuka Ai - she's so full of life! and brings a freshness in Japanese music IMO
mink - my new discover (proud)
Olivia L.... - she's original and I like her rockish style
X-Japan - because of their great music and because of Hide who was the best...
Hitomi - for Japanese girl (yup she rocks
)
Dislike - Namie Amuro - I don't like kind of music she sings and her image neither
Koda Kumi - I haven't just found anything interesting in her songs... But I may be wrong of course
Okay, I don't know good more bands/artists yet...