As of yesterday, Amazon Prime subscribers can now stream music in addition to video content thanks to the launch of Prime Music. This newly added benefit makes Amazon's $99 Prime membership even more valuable and offers instant access to unlimited streaming with no ads or restrictions. The e-commerce giant boasts the music service already harnesses a library of over a million songs and hundreds of “expertly programmed” playlists.
To put this in a better perspective, this is still far below their competitor Spotify's library which said to top 20 million songs. Nonetheless, it is still impressive considering it is a free added benefit for Prime subscribers and I'd say it is a safe bet that the company will vastly expand this library over time. The Prime Music service is supported via a web interface as well as the Amazon Music app on the Kindle Fire, iOS and Android devices as well as both a PC and Mac client.
Since I am a Prime subscriber, I was able to log into my account and test out the service for myself without any issues. The interface is clean although the process of adding songs is more cumbersome than it should be as you have to sort by artist then by album in order to select the songs you want to to add to your library all before you are able to stream them.
You can try out the Prime Music service for a free 30 days by signing up for a free trial of Amazon Prime.