Stay with me for a minute. If you listen to music, you just might Google's Music Betainteresting.
Let's assume you've got a ton of mp3s on your computer. You can listen to them on your computer or your iPod (or whatever device you drag/burn them to). This takes up a lot of digital space. And when your machine fries or you spill a little Sprite in the wrong direction, you're liable to lose all your tunes. Everyone has a story that ends badly--or has a friend who won't quit telling theirs. It is (at least in part) solving this dilemma that makes the race for the best digital cloud--better thought of as a digital locker--to keep your music in worth watching.
Like the Amazon Cloud Drive before it, Music Beta service allows user to upload their libraries of music to Google's servers, and later access them on their smart phones (Android, no iPhones), computers (at work, home, etc.), and tablets (again, Android, not iPad) without having to store them on a player. In other words: You can access your library of music whether you have your music with you or not.