The song that was the Christmas number one in 1975 and again in 1991 was "Bohemian Rhapsody" by Queen. The song was released in 1975 and was a huge success, reaching number one in the UK Singles Chart. It was re-released in 1991 and topped the charts again. It has since become a classic and has been covered by many artists, including the cast of Glee and Panic! at the Disco.