- You may be looking for the Second Doctor comic story.
"The Entertainer", originally composed by Scott Joplin[source needed], was a tune once played by Missy on the piano, while visited by the Twelfth Doctor and Bill, in her vault. (TV: The Lie of the Land)
In 1977, an ill-fated hiker whistled this tune in the woods near Fetch Priory, before his untimely demise. (TV: Image of the Fendahl)
Behind the scenes
"The Entertainer" as performed on the piano.
While this piece goes unnamed in both stories, it is easily recognisable as the 1902 ragtime two-step by Scott Joplin.