But Music Beta by Google (or, Google Music) is the real story here. It's not a store like iTunes, or a subscription service like Rdio or Rhapsody, but more of a specialized chunk of online storage. You upload your music (20GB, at first) to this storage locker online, and then can access it from your Android device--as long as you have an internet connection. To be honest, we are not huge fans of the storage locker system, as it can't hold very much music (the Xoom has 32GB of storage and a microSD card slot, so who cares about 20GB?), requires an internet connection, and forces you to upload your own music. Plus, it can never compete with a (paid) service like Rdio or Rhapsody in terms of selection. Still, though, free storage is never really a bad thing. As Google Music is in beta, invites will slowly trickle out over the next few weeks.