The Android smartphone platform keeps gaining new music traction, this time adding support for digital music services Rdio and MP3Tunes.

The free Rdio Android app went live today in beta, allowing users to browse and listen to playlists saved in their online profile as well as on-demand access to the entire catalog, much like the iPhone version of the app.

Meanwhile MP3Tunes allows users to backup their music in the company's online locker service and stream to devices with the app installed. The iPhone version of the app doesn't let users upload their music collections the way the Android App does. It's free for up to 2 GB of music and $40 a year for up to 50 GB.

How these apps stack up against other mobile music apps will be determined at Billboard's Music App Awards, taking place at Mobile Entertainment Live: The Music App Summit this Oct. 5 in San Francisco.