He asked Mr. Gruber if he would write music "for his poem" - that he might write it for two solo voices and guitar accompaniment; because the organ being broken, he desperately wanted music to be part of their Christmas Eve service.
Mr. Gruber wrote the melody to a song which has become the most beloved of all Christmas carols, Stille Nacht. In English, Silent Night - Schlaf in Himmlisher Ruh...Sleep in heavenly peace.
The Muppets and John Denver sing Silent Night
Frankenmuth, MI has a replica of the Silent Night Chapel that was originally in Obendorf, Austria