You should make sure that you're using a good AV (antivirus) program, keep it updated & use it to scan every file that you download - before you open the file.

Have a look at the thread below for lots of info about finding music (and video).
How to find music

If you don't have any security programs, this post has links to some good, free ones.
http://www.gnutellaforums.com/307974-post2.html

And also...
WARNING: Viruses on network you should be aware of!