More good Japanese songs?

I like Ayumi Hamasaki, Girugamesh, Yanagi Nagi, Nana Mizuki, and some other artists, but I'm having a hard time finding others. I've listened to songs by so many artists, but I don't like many of them. What are some good songs or good Japanese arists/bands?

What is good songs?
I love Yusa Mimori very much, but to you?
http://www.youtube.com/watch?v=6fZruOPSo1E

See also: J-pop singers/groups suggestions?
http://www.japan-guide.com/forum/quereadisplay.html?0+87730

listen to yui, ikimono gakari. very nice music and refreshing voices.

listen to this
http://www.youtube.com/watch?v=m0H-Y_7qTE8

its really a tearjerker from kazumasa oda. I think you heard it already if your watching a lot of japanese tv.

I personally like Greeeen and ONE OK ROCK

It's really up to the persons music tastes. But since I like 2 of the artists you listed, Ill recommend also Hitomi Shimatani. She's not as active now which is a shame but she has some nice songs with Japanese / Oriental flavours:

http://www.youtube.com/watch?v=KoB7jxXsio4
http://www.youtube.com/watch?v=QVdkAS4i2qU

I feel that Do As Infinity is a decent band. I'd recommend starting with their earlier stuff and working your way up, or if I were to choose an album or two for a new listener, I'd recommend the first album (Break of Dawn) and their fifth album (Gaye's of Heaven).

Oh, I'd also suggest checking out Namie Amuro.

Gates of Heaven* . Darn autocorrect.

Oh yeah, m.o.v.e is nice, too bad the group disbanded this year. For that group I would suggest the albums, DECADANCE, Deep Calm, and GRID.

Oh and when I say album for any group I mean original studio albums, not compilations or remix albums.

Crap I keep thinking of groups. I'll stop after this. lol. Anyway I also recommend the groups DREAMS CONE TRUE and maybe HIGH and MIGHTY COLOR.

Other solo artists, maybe Mai-K (Kuraki Mai) or old Hikki (Utada Hikaru) songs.