I said a singer with a really good voice as a must, which isn't really fair since there can potentially be instrumental music, even, that I enjoy. But it's very much a rarity in comparison to well-voiced music. And 'good' is meant not only subjectively, but also contextually - Mr Rammstein isn't a voice I think of as "a good singing voice", but it's fantastic in its own environment.

I would also like to add whatever genre the good .hack//sign soundtrack songs are, which might be J-pop, but I wouldn't want to say that I like J-pop because the J-pop that I *don't* like, I dislike quite a lot. So I shall call it "wispy J-pop", and would also tend to lean my goth-with-guitars and lack of goth-with-bleeps together into a single category of "wispy goth". And Indie must also be reselected as "wispy Indie", probably. So really I'd just select the single category of "wispy", and then add a few Rammstein and Bathory songs or something as the exceptions that prove the rule. Even though they disprove it, that's proof in rhetoric-world.