iTunes. Love it or hate it, we all know and hate/like/love its most basic functions. That is, it allows us to save all of our tunes in one place, sync it to our Apple-based devices, and take those tunes with us wherever we roam. Rdio joins the mobile music fray with similar capabilities tied to a subscription model (think Rhapsody, Last.fm, Pandora), but with a few twists that might make the service your go-to app for all things music on your Android phone.
All the basics are here. Choose your favorite artist or genre, press play, and let the streaming begin. With so many sources available (and more coming online weekly), there's no longer a need to sync your local collection and MP3s to your phone.
The service turns the entire sync-and-go system on its head. Instead of forcing you to purchase and upload songs to your phone, Rdio is the first service to let users save individual songs from the service to their phone. The songs can then be listened to via your phone even when you're not connected to the Internet.
That means you can, over time, save dozens (or hundreds) of great-sounding songs on your phone, downloaded directly from the service. As long as you maintain your subscription ($9.99/month), your library will play back anywhere you and your Droid go.
Add in the social experience that lets you view friends' and tastemakers' playlists, shuffle modes, play list builders, and more, and you've got yourself a worthy competitor to all the established players in the online music subscription landscape to date.