The Benny Hill Theme
From Tardis Wiki, the free Doctor Who reference
Clara Oswald added a piece of music she called The Benny Hill Theme to a video of the Mire being defeated by a Viking village. (TV: The Girl Who Died)
Behind the scenes
Like Clara, many people often refer to the music as The Benny Hill Theme, due to its use as the theme tune for The Benny Hill Show. In reality the piece is titled Yakety Sax.