We took notice when Google first announced they were going to add a music search function. If you haven’t seen the music search feature yet in your searches, you will; they are rolling it out slowly. However, you can test it out here.
I’m not terribly sold on this, but it’s a step in the right direction. What I’d want is something that searches for Mp3s like the Hype Machine, as well as torrents. But I understand the legality involved with both of those practices and how that functionality isn’t in Google’s best interests.