I just came across these tips on how to find music on Google. It would be selfish not to share:
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First, you may try this link to search Google directly:

* Search Google for Music

Here is a second example of maximizing search results on Google:

1. At Google Search, type in one of the following two phrases (try the first one; if you’re not happy with the results, try the second one on your second search):
* “index of/mp3″ -playlist -html -lyrics
* “index of/” mp3 -playlist -html -lyrics

2. If you’d like, add an artist’s name or song name to the end of the phrase, then click the Search Button.
3. Here are a few examples:
* “index of/mp3″ -playlist -html -lyrics beatles
* “index of/mp3″ -playlist -html -lyrics punk

This tip helps you find directories filled with mp3 files by finding Apache’s Index page:

1. At Google Search type in the following code:
2. +(”index of”) +(”/mp3″|”/mp3s”|”/music”) +(mp3|zip|rar) +apache
3. By editing this code, you can search for any type of media; oog, wav, pdf, etc.
4. Be sure to edit both the directory names as well as the file extensions if edited.

Finding mp3 and compressed files searching by title:

1. At Google Search type in the following code:
2. allinurl: +(mp3|rar|zip|tgz) TheTitle
3. Replace TheTitle with either a song title, artist name, or album.
4. Here are a few examples:
* allinurl: +(mp3|rar|zip|tgz) beatles
* allinurl: +(mp3|rar|zip|tgz) revolver
* allinurl: +(mp3|rar|zip|tgz) greatest hits
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****UPDATE******
Here is another link to a very comprehensive How To on searching Google for music.

Enjoy