What makes Christmas music sound so... Christmas-y?

"Rudolph the Red-Nosed Reindeer." "White Christmas." "All I Want For Christmas Is You." Aside from their subject matter, there's something about these songs that sounds distinctly "Christmas-y"... but what is it? Adam Ragusea, a professor of Journalism at Mercer University, takes a closer look at the secret chords that make up our favorite Christmas songs.

Source: http://ift.tt/2haz0KB