Junko Yagami, Anri, etc.
My friend literally just sent me this mix of retro J-Pop. It's called City Pop. Haven't listened to the whole thing, but it is quite catchy.
Oh yes and I really love it <3
IT IS MY FAVORITE.
City Pop is probably one of my favorite genres.
As for artists, the queens of the 80s - Akina Nakamori ("Mi Amore", "Tattoo", "Desire", etc) and ANRI ("Shyness Boy", "Windy Summer", etc) are my two favorites - especially ANRI, I enjoy every last one of her albums, with Timely!! being my all-time favorite. Kaoru Akimoto's album "Cologne" is also flawless. I also adore Yumi Arai, Cindy, Junko Ohashi, Junko Yagami, UA, BaBe, Kawai Sonoko, just to name a few.
If ever in need of recommendations, feel free to hit me up.
I thought you referred to old singers like from the 80's or 90's... just don't know which ones you're talking about... Let me know :D