Queen(s) of Chinese Pop

[Uemarasan]

I've always wanted to ask, who is the queen (or queens) of Chinese pop these days? I know Sammi Cheng was extremely popular a couple of years back. And there has been a lot of talk about Joey Yung lately. But what about Jolin Tsai? Is she big only in Taiwan?

So, I just wanted to know what you guys know Are there female singers who are only well-known in Mandopop but not in Cantopop and vice-versa? Are there female singers who reign supreme in certain places only (Taiwan, Hong Kong, Singapore, Mainland)? Or are there those who are big in the whole Chinese-speaking world? I'd appreciate some help Thanks!