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"We're so used to Google Labs features on commonly used services like mail and maps that we often forget they're technically experimental and now Music has a few of its own. The new features available on the desktop version of its web player include toggles for an HTML5 player (there was already a mobile version for iOS) instead of Flash, Gmail-style desktop notifications (Chrome only) and the ability to rate music on a five star scale instead of just thumbs up or thumbs down. There's been a steady of stream of updates to the Music arm of Google Play since it was first announced last May, now that the velvet invite rope has been lifted has it become a part of your daily soundtrack?"^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.engadget.com/2012/04/09/google-play-music-labs-html5-notifications-ratings/>