KT Tunstall 

Kate “KT” Tunstall (born 23 June 1975) is a BRIT Award winning, Grammy-nominated Scottish singer and songwriter. She broke into the public eye with a performance of her song “Black Horse and the Cherry Tree” on Later with Jools Holland. She has enjoyed commercial and critical success since, selling over four million albums and picking up three BRIT Awards and two Grammy nominations.

While her first name is Kate, she chose to go by KT as her first name, saying “[Kate] just makes me think of a buxom lass baking bread for her man working in the fields. I have no problem with that, but it’s just not really how I pictured being a rock star.” Also, Tunstall spells her first name KT (as opposed to Katie) to differentiate herself from singers with similar names. :P

Source: wikipedia

To listen to her songs you can check her MySpace and her Official website: www.kttunstall.com  ;)
I also posted a video of her The Late Show with David Letterman performance for her song “Suddenly I See” on my vodpod or just click on the videos to share on the right column of my main page. And I also posted her latest video on an earlier post. Check it all out. :)