As of today, Amazon offered its Prime Music service to subscribers in Germany.
Everyone that has a prime account, now also get millions of curated songs for free with their subscription.
Unlike Spotify and Google Play Music, this is not a real music flatrate in the same sense. But of you looking for an ad-free radio service with some tuning options and varieties of genres, this might come handy.
Prime Music is usable via the web interface or the app available for smartphones.
Well, too bad there is no Chromecast button, so it might not get used very much, but FireTV has integrated it very well, so enjoy.