Unusually, both the Hillsborough single and the X Factor song were available on CD - increasingly a rarity in an era when downloads account for 99% of all single sales.

BBC: Hillsborough single is Christmas number one

The only serious omission on the CD is Strawberry Fields Forever - a number one single as a double A side with Penny Lane - and one can only imagine that the single was sacrificed to make way for one of George Harrisons' songs.

BBC: CD Review: The Beatles

He works with low level electronics and he's about to release the 1-bit Symphony on a single microchip, housed in a CD case.

BBC: How computer games are creating new art and music