I seldom listen to female Pop and R&B artists, since they don't interest me much, but I do listen to a few pop artists like Ueto Aya, Koda Kumi, Ootsuka Ai, Amuro Namie, Nakashima Mika, Hamasaki Ayumi, Day after tomorrow, and Tamaki Nami. ^^ And as for Crystal Kay, no, I didn't take time to listen to most of her songs... All I can think of is the song, Koi ni ochitara, which I liked very much, since it pretty pleasant. I believe I first heard on a Japanese drama show, a name that I can't seem to recall. @.@ It was a good show though.