[Discuss] What Makes A Good/Bad Head Voice ?

Charlotte Church's four EP's are on heavy rotation at the moment, and they got me to thinking.

One of the (many) things I love about this particular Diva is her glorious head voice. Rich, full and operatic, its versatility is shown repeatedly throughout the four releases by an artistic and sparing application of it. Of course, the quality of her top notes are hardly surprising when you consider Church's beginnings in the classical arena.

Still, as I said above, listening to her got me thinking: what actually makes a good head voice when it comes to popular/commercial music- is it its colour, weight, or individuality? Is it even something most people care about?

There are a multitude of factors that go into deciding, but which are most the important to you when assessing whether you like or dislike a particular upper register? In addition to that, which Diva(s) do you think have the best/worst top notes (not including whistle register)? Leave a video with your comment, if you can.

(Below is the coda from Charlotte Church's epic Sparrow- taken from EP Three. Thought I'd attach so you guys can get a taste of her head voice.)

Thoughts?