In a blog written by Fran Healy, shortly after this was recorded, he wrote that this was a very straight forward mix for the producer Emery Dobyns. He added: "He put it to bed in a matter of hours. This is the gong song. The gong we learned is actually called a tam tam and is used to great effect on this track. There is a 45 second drum fill at the end which brings the album to a fitting finale, like fireworks exploding."
The lyrics for "Mary, Did You Know?" were written by Christian singer and comedian Mark Lowry, after his pastor asked him to write a Christmas musical for their church. Southern gospel musician Buddy Greene later added music to his words.