Google Music Trends

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Google Talk Basics: What is Google Music Trends?
Music Trends is a snapshot of the music that's popular right now among Google Talk listeners. Every Talk user who has opted in to Music Trends will cast their vote automatically, each time they listen to music on their computer and share their music status in Google Talk. We'll gather this information and display the trends by country and by genre, listing the favorite songs of the most musically-active locations around the world.

Click through from the results to information pages about the artist or album, courtesy of Google's Music Search. One more click and you could be at one of a number of online stores from which to buy the music, either as a digital download or on physical media.