Here is a romanized list:
RED: Ishikawa Sayuri, Lee Jung Hyun, Ueto Aya, Every Little Thing, Otsuka Ai, Kawanaka Miyuki, Kuraki Mai, Kobayashi Sachiko, Sakamoto Fuyumi, Shimakura Chiyoko, Shimatani Hitomi, Tendo Yoshimi, DREAMS COME TRUE, Nakashima Mika, Nakamura Mitsuko, Nagayama Yoko, Natsukawa Rimi, Nochiura Natsumi, Hamasaki Ayumi, Hitoto You, Hirahara Ayaka, Fuji Ayako, BoA, Mizumori Kaori, Morning Musume, W, Moriyama Ryoko, Wada Akiko.
WHITE: Itsuki Hiroshi, w-inds., EXILE, ORANGE RANGE, Gackt, Kawaguchi Kyougo, Kishidan, Kitajima Saburo, CHEMISTERY, Gospellers, Sada Masashi, John Ken Nuzzo, TOKIO, Toba Ichiro, nobodyknows+, Hikawa Kiyoshi, Hirai Ken, Fuse Akira, Hosokawa Takashi, Horiuchi Takao, Porno Graffitti, Maekawa Kiyoshi, Matsudaira Ken, Mikawa Kenichi, Mori Shinichi, Yamamoto Jouji, Yuzu, Ryu.
There are really too many male enka singers
