Rdio is a streaming, social music service.
Primarily, Rdio streams music to various mobile devices. The different subscription plans allow for various levels of connectivity with mobile access a part of one subscription plan.
The service promotes unlimited streaming for all the songs that they have. It is also possible to sync music to mobile devices so songs can be listened to offline.
Quality on Rdio is impressive. Streaming over Wi-Fi, songs buffered quickly and the audio quality was good. Listening through headphones, the songs contain good equalization. Rdio did not have any loss of quality while listening to a variety of songs.
Using Rdio, there are options for your personal collection of music, new releases, and top charts. Heavy Rotation is similar to top songs which can be sorted by the whole service or just your friends. Social aspects of Rdio allow you to discover new music through friends or the various collections and playlists others create.
Rdio is a great music service because the amount of songs is impressive, but like most online music services, there will be some music that they may not have.
Rdio is perfect for the streaming music fan.