All rock fans have now are the Black Keys. And the countless other rock bands that are overlooked by the Top 40 but still produce great music, of course.

A study by the Martin Prosperity Institute assigned each metropolitan area in the United States a "Metro Music Index" according to the concentration of musicians and of businesses in the music industry. Ongoing studies are also incorporating online information from networks central to the music industry, such as MySpace.

The top 10 metro areas with the largest index are:
1. Nashville, TN
2. New York, NY
3. Los Angeles, CA
4. San Francisco, CA
5. Seattle, WA
6. Las Vegas, NV
7. Portland, OR
8. New Orleans, LA
9. Rochester, NY
10. Minneapolis/St. Paul, MN

I thought proofs were supposed to tell us something we didn't already know.

You've always been sad about it, but now you can quantify your creys!