Google Music has gone live, taking its beta cloud-based personal music library service and adding multiple device synching, purchasing, Google+ integration and exclusive content. Much more interesting capabilities, however, are the ability to share songs and the Artist Hub feature for musicians who want to control their own fan sales and relationships. More at
http://www.dmwmedia.com/news/2011/11/16/google-music-plugs-in-its-amps-with-videos-from-launch-event