Music has always been an essential part of the Christmas season. While I like some of the fun, classic songs of the season, my favorite Christmas songs will never be heard on the radio. The songs I revere most are the ones that move me, whether for the gorgeous instrumentation, the vocals, or the text to which its set. Here are seven Christmas songs that make me cry.     O Come, O Come, Emmanuel This is my favorite Christmas hymn. I love the mystery of it. This arrangement by The Piano Guys is so beautiful and mysterious and simple, it moves me.   O Nata Lux I am a…