Twitter has launched what it described as a 21st century version of the mixtape, with a new app that recommends tracks to music fans based on the artists they follow. Fans of artists such as One Direction or Adele will be able to listen to their latest hits from within the social nework using the #Music app. A #NowPlaying screen will show Twitter users all the songs being tweeted by the people they follow, famous or not, and let them listen along.