MP3 was a file format popular for storing music, and other audio tracks. Around or before 2009 Dara Morgan created a torrent site with downloads that had four times the quality of MP3. (PROSE: Beautiful Chaos [+]Loading...["Beautiful Chaos (novel)"])
The Fifth Doctor likened the Concordum to an "MP3 player on a planetary scale". (AUDIO: The Demons of Red Lodge [+]Loading...["The Demons of Red Lodge (audio story)"])