Clearly Amber can sing! If you listen to her versions in the show of bust my windows, hate on me and the boy is mine she does the songs justice, when she sang a snip of MJ on Jonathan ross she showed she could sing.

Now, She isn't whitney! Its hard to sing whitney because a big part is tone and Amber doesnt have the same tone, but this doesnt mean she cant sing.

Charine can sing but for me her voice is generic and she sings by numbers. I like to hear a voice that without the glitzy videos you know who's singing, that you can hear a ad lib, run that is unique to the singer and not some one that can sing the song exactly as you hear it