The music app that is adding subscribers to its service at the fastest rate is not Apple Music or Spotify or Google Music, it is Amazon, Financial Times reported this week [Editor’s note: the link may be paywalled; alternative source]. From the report: The number of people subscribing to Amazon Music Unlimited has grown by about 70 per cent in the past year, according to people briefed on its performance. In April Amazon had more than 32m subscribers to all its music services including Unlimited and Prime Music. By contrast, Spotify, the world’s largest streaming service with 100m subscribers, is growing at about 25 per cent a year. “Amazon is the dark horse [in music],” said Mark Mulligan, an analyst at Midia Research. “People don’t pay as much attention to it [as to Apple and Spotify], but it’s been hugely effective.” […] Amazon has gained momentum in recent months, propelled by its ubiquity with consumers and Alexa, its popular intelligent assistant, which can play music through voice commands issued to its wireless Echo speaker.