i like Ayumi Hamasaki, and the two best seiyuu, Yokko Kanno, Mayaa Sakamoto.
I have almost everything from Ayumi.
Yokko Kanno has done quite a few anime soundtracks (Escalfowne Movie, GITS:SAC, etc) & Mayaa Sakamoto... I like her voice. She's done Escalfowne's OP (Yubiwa) and Rahxephon OP.
does Nobou Uetmatsu count? i guess not, huh. it's more like video games.