Chopsticks (composition)

While visiting Villa Diodati with the Thirteenth Doctor in 1816, Ryan Sinclair played a tune on the piano, but kept hitting the wrong notes. Despite this, Mary Shelley enjoyed the tune and stated that it had "such a jaunty air"; John Polidori, however, kept flinching during Ryan's performance and had a look of great discomfort on his face. When Shelley asked if the tune was popular in the colonies (where the Doctor had stated that she and her companions were from), Ryan replied, "Er, yeah", explaining that his nan taught him how to play it but he always got the keys wrong. (TV: The Haunting of Villa Diodati)

Behind the scenes
Ryan Sinclair plays "Chopsticks" on the piano in The Haunting of Villa Diodati. However, the tune is is not identified by name.

In the real world, "Chopsticks" was written in 1877, 61 years after the episode is set.