Google knows all
Trust Google not to let good information go to waste. Google Music Trends lists what the world is listening to, or atleast what users of Google Talk are listening to. You can sort by Genre as well as country, but only the US is available as of now. They do have a “Hindi” genre though. Interesting - Iron Maiden completely rules the heavy metal genre, with Hallowed Be Thy Name topping the list. Lovely.
