My favorite Christmas song

So, this year I have a favorite Christmas song.  I have taken the liberty of posting it here in a playlist for all to hear! (It is the first song.)  I like it because it is such a doctrinally rich song, especially compared to some other Christmas songs out there.  (Bing, you know I love you, but I just can't get behind thanking "the Lord above because Santa Claus comes tonight." That's not exactly what we're thankful for this time of year.) I also really like the way the music feels so mysterious yet also so full of excitement and rejoicing.  I feel like it does a great job musically representing the mysteries of God, and the excitement of knowing we can all find them out because He sent His Son.  It's kind of old-meets-new-testamenty.  I likes it. 

Below the playlist, I posted the full lyrics to the song. 

O come, O come, Emmanuel
And ransom captive Israel
That mourns in lonely exile here
Until the Son of God appear
Rejoice! Rejoice! Emmanuel
Shall come to thee, O Israel.

O come, Thou Rod of Jesse, free
Thine own from Satan's tyranny
From depths of Hell Thy people save
And give them victory o'er the grave
Rejoice! Rejoice! Emmanuel
Shall come to thee, O Israel.

O come, Thou Day-Spring, come and cheer
Our spirits by Thine advent here
Disperse the gloomy clouds of night
And death's dark shadows put to flight.
Rejoice! Rejoice! Emmanuel
Shall come to thee, O Israel.

O come, Thou Key of David, come,
And open wide our heavenly home;
Make safe the way that leads on high,
And close the path to misery.
Rejoice! Rejoice! Emmanuel
Shall come to thee, O Israel.

O come, O come, Thou Lord of might,
Who to Thy tribes, on Sinai's height,
In ancient times did'st give the Law,
In cloud, and majesty and awe.
Rejoice! Rejoice! Emmanuel
Shall come to thee, O Israel.