Sorry, I don't quite get it.... the links above has no reference
to karaoke, and as far as I can make out, the articles talked about
proper worship through songs.
On the topic: to me, there is no such thing as Christian karaoke.
Christian singing and karaoke singing are mutually exclusive.
The first one is a worship where songs are sung specifically to God
and to encourage the people of God,
The second type of singing is done mainly as a form of
entertainment, or stress relief.
Sure, one can purchase a minus-one disk and use it as a worship
background music, but this is not karaoke.