u can stream an enormous quantity of music: the best artists, the latest albums, the biggest hits, and everything else. The service (and its interface) is very similar to Spotify, just to give you an idea.
Once you have Music Pass, you can access content even when you're offline. So just like with Spotify, you can choose albums, artists, and playlists to listen to without a connection.
Microsoft Groove is an interesting application for music lovers that's especially useful for anyone who has an Xbox console or works with Windows.