The story behind 'Silent Night':
Father Joseph Mohr wrote "Silent Night" when he was a young priest serving as parish priest at St Nikolas Church in Oberndorf, Germany. Two days before Christmas 1818, the bellows in the church organ were found to be rotted through. Mohr wrote a poem and asked the church organist and choirmaster, Franz-Xaver Gruber, if he could set it to music which the two men could sing, accompanied by Mohr on the guitar. Late on Christmas Eve, the men practised the song for the first time, and performed it for Mass. "Silent Night" is still sung at Christmas time around the world today.
The link below shows the full history.