At Haywire Hacking and others, you can find ways and means to download songs you do not own and do not have rights to keep. The article "Hacking Google: Turning a Search Engine into an MP3 Downloader"is one such post that gives a quite easy way to get donwloads using a technically based search.
"Copy / Paste the code below into your Google search box:
-inurl:(htm|html|php) intitle:"index of" +"last modified" +"parent directory" +description +size +(wma|mp3) "Where"
That's the hack in a nutshell,"
They also have a disclaimer that reflects the true nature of the above code "