Ayumi Hamasaki, Nana Kitade, Namie Amuro, KOKIA, Ai Otsuka, Koda Kumi, Hitomi Shimatani, Chitose Hajime, Mika Nakashima, Utada Hikaru, BoA, Maki Goto, Aya Matsuura, Aikawa Nanase, Fukuyama Masaharu, Mai Otome, Morning Masume, Shibasaki Kou, Suara, Kayo Aiko, Fujiki Kazue, Chihiro Onituska, Ayaka, Amano Tsukiko, Aya Hirano, Koharu Kusumi, Mai Kuraki...and many more.
Note: These are all female, cuz I dun like male singers. Either way, this should give you a good start.