Google Hack for free MP3s
Type the following in Google:
-inurl:htm -inurl:html intitle:"index of" mp3 "Black Sabbath"

I'm just downloading "Paranoid" now. It may be illegal but its fair: I've bought "Paranoid" on vinyl, cassette tape, and CD (several times). I have paid Ozzy Osbourne my dues! I came across this Google Hack on tech-recipes.com