Why do Christmas songs sound like Funeral marches?

So if you're wondering, YES I did make it back to the States... and since I've been here I've discovered that my Latin influence runs deeper that I thought.
Because it is Christmas time, I've already heard about a million and one Christmas carols and I thought to myself the other day, WHY do a lot of the carols sound so sad and depressing. I mean, think about it... start singing some Christmas songs in your head. It came upon a Midnight Clear... What Child is This... and finally Silent Night. And I kinda laughed when I thought about how "Silent" that "Night" actually was... let's see, we have a virgin mother giving birth in AWFUL conditions, barn yard animals, a TON of people in the small village of Bethlehem, shepherds, a HOST of angels singing... does that night sounding silent to you? It sounds like a Loja FIESTA to me!!
And as I thought about a Latin fiesta, I thought now THAT is what our Christmas carols should sound like. I'm convinced that the angels singing sounded more like salsa music than opera!
With all that said, I realized that sometimes I forget how truly exciting the birth of Christ was (and is). This is not something to solemnly speak words to, it is something to yell from the rooftop: "MY SAVIOR IS BORN!!!"
So how silent will this night be? It depends on how loud you proclaim the Savior's birth.