Since Kai is an OC, I can't exactly point to YouTube video clips. (Oh how I wish I could!) But in my head she sounds a lot like Alison Krauss. Except .. well, without the twang. Kai's from France, not Illinois. I love Alison's voice, and.. I think it fits better for Kai than the actual PB's voice (though I love Taylor's CD..)
Singing "If I didn't know better" (embedding disabled)
Singing "If I didn't know better" (embedding disabled)