Spotify

Spotify was an audio streaming service used by humans to listen to music. (TV: Knock Knock) Its logo was a green circle with black, curved lines within it. (WC: The Zygon Isolation)

Bill Potts had a whole playlist on Spotify with Little Mix songs, including "Black Magic". (TV: Knock Knock)

Petronella Osgood had the application installed on her computer by 10 May 2020. (WC: The Zygon Isolation)

Behind the scenes
Several Doctor Who and Torchwood soundtracks are available on Spotify, as well as several Big Finish audio stories.