My favorite Christmas music, Handel's Messiah, is not only about Christmas, but rather about all of the life of Christ, from the prophecies of His coming, to His birth, His ministry, Passion, and coming again. Last year I saw a play which reenacted some of the events surrounding Handel's composing Messiah and its first performance. There was actually a bit of scandal involving one of the soloists, which Handel had to deal with by applying a bit of firm but loving persuasion, showing him to be a quite gracious and compassionate man.
The entire work is based on scripture. The portion dealing with the Nativity sets the prophecies of John the Baptist's and Jesus' coming to music, then the Christmas stories. My favorite selection is the music based on the following verses:
The voice of one crying in the wilderness: "Prepare the way of the Lord; Make straight in the desert A highway for our God. Every valley shall be exalted And every mountain and hill brought low; The crooked places shall be made straight And the rough places smooth; The glory of the Lord shall be revealed, And all flesh shall see it together; For the mouth of the Lord has spoken." Isaiah 40:3-5 NKJV
There is quite a bit to be said about getting ready for the Lord. I decided to follow Jesus on June 21, 2001, yet I was getting ready for at least eight months before that. Looking at things and beliefs I was holding onto in my life and asking myself "do you really think it's good for you to be doing that -- or believing that?" Confronting myself, saying "you know He's right - give it up and follow Him." Eventually it came down to one day that I realized "now is the day of salvation" and stopped arguing with God.