There is non-copywrited material available as well, so technically the sharing service is not violating any laws, merely enabling you to be able to. Providing roads and stop signs doesn't keep you from using the roads at illegal speeds and running the signs.

I used Kazaa for a while and found it loaded with malware. I have been using limewire for over a year and am very happy with it.

There is a lot of valid legitimate music out there to be downloaded. Some of it is even good.
check out oddiooverplay and comfortstand. They have a lot of stuff and links for more stuff. basichip is offering out of date children's albums for download, one new one a week for all year.