If you're asking about the winter 2008 tv spot featuring a female singer with a female accompanying on fiddle, that would be Alex J. Robinson who sings it.
Here's a link to her offical web site: http://www.alexjrobinson.com/
alessis
Anastasia
everyone sings jingle bells.
I don't know the true answer, but my guess is Nene from Real Housewives of Atlanta.
Erin McKeown
Jingle (APEX)
Anastasia
Suzie McNeil.
The song used in the KIA Magentis TV commercial is called "Koop Island Blues" by the Stockholm duo Koop. It is the first track on their 2007 CD called "Koop Island".
Bob Rivers
Dolly Parton
Mark Behrens sings the Shaw's Jewelry Jingle. Mark even writes his own jingles and is very much in anything to do with jingles.