I was jsut wondering if there is a way to preview the songs before downloading them? Thanks

You can download a small part of a song and preview that. But no, not with out downloading.
If you then decide you don't want it kill the download and delete the incomplete file from the limewire library.

(Be very careful what you delete from the Limewire Library) ....that's another story.

I advise unchecking the use limewire player in preferences, and using iTunes as IMHO if you hear a preview in Limewire you will not want to continue the download, because it will sound rough as old boots..... well that's my experience only :-)