Music is inherently social. People make music together. Friends share tunes, follow bands, attend concerts, groove to the same songs. Apps that incorporate social media and music are extremely popular. Rdio is a paid service that gives you access to streaming song tracks and playlists from a library of 8 million tunes.
A neat Rdio interface lets you follow what your Facebook and Twitter friends are listening to. They can check out your latest musical discoveries, too. Rdio also lets you tune in to artist-created radio stations. The app can also check your home collection of stored tunes that you've purchased from the iTunes Store or other sources, and give you access to these songs on the go. Rdio mobile apps work with Android and Blackberry devices, iPhone and Windows Phone 7.