Oldfield's ""In Dulci Jubilo"" is an instrumental version of the German traditional Christmas carol of the same name, known best in England as "Good Christian Men Rejoice". Mike Oldfield had recorded another version with Les Penning of this song as the B-side to his previous single, "Don Alfonso", which did not chart. Later, he felt a better version could be done, and re-recorded it in October 1975 at the Manor, but incorporating some of the previous version's backing tracks recorded November 1974 at the Beacon, his home studio.