Silent Night, Holy Night
Silent Night, Holy Night is a 1976 Australian animated television special produced by Hanna-Barbera and written by Gene Thompson.
During a choir practice two days before Christmas, village organist Franz Gruber is worried to hear unusual sounds from the church organ and suspects the bellows. One of Gruber's sons discovers mice in the pipes of the organ and the mice have chewed up parts of the organ. Without the organ the church choir cannot perform the rehearsed Bach piece because the music was written to be performed with an organ.