Those of you who were Rdio users prior to purchasing a Samsung Galaxy Nexus were probably wondering when it would be updated to Android 4.0. It is now perfectly compatible, and even underwent a much welcomed UI transformation. Like other music streaming apps, Rdio offers an great collection of over 12 million songs that can be instantly streamed to any Android device.
Just like Spotify and Grooveshark, songs can be cached for offline playback. It's hard to decide which one to subscribe to - as all offer access to so many songs. But more likely than not, you've already taken a liking to one prior to reading this. And there, you've made your playlists and populated your music library through your personal account.
So why would you jump services if all offer the same features? You wouldn't. And that's why survival and growth completely depends on future device compatibility. As long as Rdio, Spotify, Grooveshark, and many others continue to support the latest firmware and devices - they'll be able to retain there subscribers.