updated 12:02 pm EDT, Tue October 29, 2013
Compliments existing iOS client
Amazon has released a native Cloud Player app for the Mac. The software lets people both play and buy music from the Amazon MP3 Store. It can also automatically import music from iTunes or CDs, though, and be used to export libraries to other music players. Any music stored in Cloud Drive is accessible on other platforms with a Cloud Player app, including Windows, iOS, Android, Roku, Sonos, Samsung TVs, and the web.
The music playback interface incorporates album art and access to photos, biographies, and Twitter posts from the artists. Playlists are created using a drag-and-drop interface. The app is a free download, and requires OS X 10.6 or later.