"On Horseback" features Mike Oldfield on vocals, accompanied by a children's chorus credited as the Penrhos kids. It previously appeared as an untitled song at the end of Oldfield's 1975 album "Ommadawn", banded separately but merely listed as part of "Ommadawn Part Two" on the label. The album's liner notes refer to it as "the horse song on side two". Virgin Records recognised this song could also be a contender as a Christmas hit, and was already being played on radio before it was issued as a single; therefore the UK single's label bore a large "A" on each side to encourage radio play of both sides. A large "A" is often used to mark promo records, and copies are often misidentified as promos, but all have this mark.