Today Google is officially launching built-in music playback results on regular Google search queries.
Much has been made of this new feature, and it certainly will make it easier for users to get straight to a song they're looking for, but it's not something we're getting all that excited about. We'll admit that finding and playing back a song when all you've done is search for lyrics is kind of cool. Still, Google already puts video results from YouTube in the search results page, and more often than not they're what you're looking for, anyway.
Right now we're not seeing the updates in our results, but chances are you'll start seeing them in the next day or so if you aren't already.
Making search more musical [Official Google Blog]