So, go to Google and type in a random band. WTF!? Random information about that artist! In case it's being geotested, I've added an attachment. I've never seen this done before.
It does exist since some times now. I think december 2005. There is also : http://www.google.com/musicsearch?q=the+killers http://www.google.com/musica?aid=rs_VvG4F1JB&sa=X&oi=music&ct=result The 2 first links on the result page.
If you make a query with a singer or band name, you've got specifics results about this artist. But of course, the band or artist need to be a little famous. My band playing only in my garage, don't appear on Google.