Silent night, holy night
more Christmas carols on Quotography
The origin of the we know as was a that was written in 1816 by an Austrian priest called Joseph Mohr. On Christmas Eve in 1818 in the small alpine village called Oberndorf it is reputed that the organ at St. Nicholas Church had broken. Joseph Mohr gave the poem of Silent Night (Stille Nacht) to his friend Franz Xavier Gruber and the melody for Silent Night was composed with this in mind. The music to Silent Night was therefore intended for a guitar and the simple score was finished in time for Midnight Mass. Silent Night is the most Christmas carol of all times.
Origin history from here.