It is almost impossible to comment something from which there are tears in the eyes, especially if you listen to this pop song performed mostly by female voice along with the most touching parts of the film. Alison Krauss & Robert Plant made most sentimental music that is required to listen periodically to remember the magic of Christmas night. About the magic of life & the fact that happiest moments remembered the longest go from simple things. And appreciated the same.
Reference: "The Light Of Christmas Day" SongFacts
The Light of Christmas Day lyrics - Robert Plant & Alison Krauss