""Silent Night" (German: Stille Nacht, heilige Nacht) is a popular Christmas carol, composed in 1818 by Franz Xaver Gruber to lyrics by Joseph Mohr in the small town of Oberndorf bei Salzburg, Austria. It was declared an intangible cultural heritage by UNESCO in March 2011. The song has been recorded by a large number of singers from every music genre." -Wikipedia
Not to be confused with Hans Gruber from Die Hard.