The so called reliable sources are opinion based and are no more importent then your or mine. And you are not getting the point of what Mark Jansen is saying. He dose not have a problem with it because he can't change there minds. 

"On top of that you are "Epica uses a "trademark of many symphonic and gothic metal bands" in contrasting "two extremes, death grunts and brutality on one side, airy female melodiousness on the other."

Here's The Project Hate http://www.youtube.com/watch?v=8mJk6hD9czY
Shocking the use brutality death grunts and female melodiousness voacals to. Yet they are Death meatl.

"attraction ultimately hinges on exploring the sonic contrasts of light and dark; the punishing intensity of those elephantine guitar riffs and hyperactive drumming cast against the soaring, layered sweetness of the orchestrated strings and keyboards."

Yeah them and evet other Meatl band that dose that to Ram-Zet http://www.youtube.com/watch?v=gTTUP43nq9k

"The group is also known to employ human choirs and orchestras with additional embellishments such as spoken word recitals and lyrics in Latin and Arabic"

I can name so many metal bands that do that. That is it not something that Gothic Metal just uses.

And again I will say knowing your subject makes it much more easy to edit a page. But going by ever thing you say I should go Edit the Kenny G page to what ever the so called reliable sources. Reviews are opinions ever one has them and reviews from so called reliable sources mean jack.