Looking For Female Vocalist For A Few Heavy Metal Songs

Specifically, one that sings "clean," I'm not looking for a screamer/ growler/whatever. I want to be able to collaborate with you and you with me on the songs, not simply tell you what to do, and then pay you to do it (music is art, as far as I'm concerned, and I don't feel I have any business telling someone how to do an art.) I'm not looking for you to do entire songs, just specific lines in parts of them, like one that I'm working on now could really stand a bit of a female touch in the chorus. Another one may only need backing vocals on a verse, things like that. But I want to emphasize that I would prefer to work together to get a final outcome we both like and are proud of. Essentially, I want this process to be a creative one, and not just a business transaction.