I don't remember my previous list, but it's changed
.
1. Hamasaki Ayumi
2. Amuro Namie
3. Utada Hikaru
4. Uematsu Nobuo <- does videogames composers count?
5. MONKEY MAJIK
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oh, well I make my top 20
lol
6. Kanno Yoko <- same as Nobuo Uematsu lol.
7. Sakamoto Maaya
8. KOKIA
9. Shiina Ringo
10. alan
11. Perfume
12. Nakagawa Shoko
13. BONNIE PINK
14. Rie fu
15. Tsuchiya Anna
16. OLIVIA
17. Rurutia
18. Koda Kumi
19. BoA
20. ORANGE RANGE