Use Google to search for free MP3 recordings

The web is really a wonderful playground to find and share information with people all over the world.  A recent article I found talked about using search strings in Google to find free MP3 recordings. This will work with any artist or subject.

"index of" + intitle:mp3 + beethoven

Looking for free music files on the Web is quite simple if you know how to frame your search queries. The information in this article is intended for public domain, legally obtainable content.
There's an easy way to find free MP3 files with Google; actually, there's quite a few easy ways. Here's one (this particular method via Tech-Recipes):

-inurl:htm -inurl:html intitle:"index of" "Last modified" mp3

Okay, so let's break this down. You are attempting to find directories, so you don't want a a Web page (hence the minus sign in front of both the htm and html extensions). You're looking for the root directory, so that's where the "index of" in the title (intitle) comes in. And that mp3 file designation? You can change that to any file you are wanting to look for: wma, pdf, etc.
Now, how about looking for specific artists? Easy:

-inurl:htm -inurl:html intitle:"index of" mp3 "beethoven"

Make sure you put the artist's name in quotes at the end of the search string. Now, there's another way to do this that might be a little bit easier; you're just changing the order of your search query around.

intitle:index.of + mp3 + "beethoven" -html -htm -txt

Basically, you're doing the same thing that you did in the first search string. You can narrow it down even further if you want to:

"index of" + intitle:mp3 + beethoven

All you're doing here is looking for directories with MP3 in the title and Beethoven.

There are more helpful hints at about.com below:
http://websearch.about.com/od/dailywebsearchtips/qt/dnt0824.htm