Pink Floyd

Pink Floyd was a musical group known to the Doctor and some of his companions.

The Sixth Doctor liked Pink Floyd, especially the album. (PROSE: Business Unusual) About a thousand years later, the Twelfth Doctor whistled part of the melody of "" as he observed Clara getting some children at Coal Hill School into trouble. (TV: The Caretaker)

Unlike the Doctor, Sam Jones didn't like Pink Floyd. (PROSE: The Scarlet Empress) Chris Cwej was at least passably au fait with their work, since he knew about Battersea Power Station from listening to Pink Floyd's as a student. (PROSE: Anteus) Ace was reminded of the Pink Floyd lyric, "There's someone in my head, but it's not me", when she heard Azathoth's voice. (PROSE: All-Consuming Fire) And Fitz Kreiner once tried to play "" by Pink Floyd on his electric guitar, but Anji Kapoor was so unimpressed that she thought he was attempting the theme song. (PROSE: The Slow Empire)

Behind the scenes
The Caretaker does not identify "" as a work by Pink Floyd, but contextually it is exceedingly clear that he is in fact whistling that tune.