Get the latest LW (4.9.40+) http://www.limewire.com/english/content/download.shtml
It has a spam filter which can be trained. As you add files as junk, the filter learns to recognise those files by either the name or file size.

Older Forum discussions about these spam files are here: 1. autogenerated spam results, & also
2. autogenerated mp3 spam results

If you look at those links about spam, it'll help you to use the spam filter effectively. You should also be aware of these too: A. WARNING: Viruses on network you should be aware of! (click on link), &
also B. Direct instructions to eliminate porn from results