In 1984, Horn was approached by Bob Geldof to produce the song "Do They Know It's Christmas?", but he was unavailable. Instead, he gave use of SARM West Studio free of charge to the project for 24 hours, which Geldof accepted, assigning Midge Ure as the producer instead. The song was recorded and mixed on 25 November. Horn produced the B-side featuring messages from artists who had and had not made the recording, including David Bowie, Annie Lennox, Paul McCartney, Big Country, and Holly Johnson. They were also recorded over the same backing track as the "Do They Know It's Christmas?"