Google has followed Yahoo and other search engines in picking up music-related searches and providing extra information. This isn't a separate search service. However, if you enter a search for, say, Keith Jarrett, then an extra result is added to the top, with a photo of KJ, mentions of some albums, and a link that says More music results for keith jarrett », with a list of albums etc.
It works much like the extra results from news stories. Indeed, if you search for an artist who is also in the news, such as Eminem or Britney Spears, the music results come below the news results.
However, there are limitations to Google's musical offering. It works for Simon Rattle and Philip Glass, but there's no similar result for Hilary Hahn or Luc Ferrari.
I notice there's also no music result for Arctic Monkeys, though that may be in the works. Perhaps in the future, recognition in Google music search will be a sign that a band has really arrived....
