Daisy Bell

"Daisy Bell" was a song performed at the Palace Theatre whilst the Fourth Doctor and Leela were attending. (DW: The Talons of Weng-Chiang) In 2367, Robot 1 and Robot 2 sang this song when the Eleventh Doctor deactivated them. (DW: Dinosaurs on a Spaceship)

Behind the scenes
The robots singing "Daisy Bell" as they died is a reference to HAL doing the same in Arthur C. Clarke's film.