Singer

An unidentified female singer aboard the Orient Express in space performed "Don't Stop Me Now" during a visit by the twelfth Doctor and Clara Oswald. It is not known whether she was an actual person or one of the hard light holograms created by Gus to populate the train. As such, her fate after the destruction of the train/spaceship is unknown.

Biography from the TARDIS Data Core article, licensed under CC-BY-SA