One of the things I really liked about the recent Thanksgiving/Christmas/New Year's episode of Grey's Anatomy -- "Holidaze" -- was the music. I went to the show's web page the day after it aired seeking to download several of the tunes (Ingrid Michaelson's Snowfall) used to amplify the mood during the emotional episode. (My favorite scenes involved Bailey and her dad, and Meredith and her de facto dad Richard).
What I was really seeking as I browsed through the list of tunes was the a cappella version of Silent Night sung by Sara Ramirez who plays Dr. Callie Torres. While I haven't yet found this particular recording made available in a downloadable form, ABC has posted a music video where scenes from the current season of Grey's are shown as we hear Ramirez's beautiful rendition plays. Enjoy.