If you're referring to THIS new commercial featuring an old gentleman who receives several scratchers as a holiday gift (See related Link), the song is Claude Debussey's Suite Bergamasque and can be found here: (See related Link)
Guster -- Tiny Tree Christmas
Holiday - Vampire Weekend
For the December 2013 Holiday commercial, the song is "the Greenest Grass" by Joshua Radin.
Vampire Weekend, the song is called "Holiday"
The song is called "Island In The Sun" by Weezer.
Originally, I think was a Beatles song.
Jingle Bells
One classical Christmas song that has been used in a Garmin commercial is "Carol of the Bells." This song is a popular choice during the holiday season and its use in the commercial adds a festive touch to the advertisement.
The name of the song in the latest Kia commercial is Applause by Lady Gaga. The song is featured in a Soul commercial.
Ezra Koenig of Vampire Weekend.
Guster - Tiny Tree
The name of the theme song to Roman Holiday is called Roman Holiday. It is 3 minutes and 1 second in duration.