Just because file sharing programs like Limeware are still active, it does not mean that a huge potential liability for the website is not being established by allowing music "trading" on it. I don't know much about Limewire....but Kazaa, for example, went to extremely great lengths and expense to combat any potential RIAA efforts to stop it. Lengths and expenses that the Admin of this site will not want to go to.
This site is small, so it may not get "noticed" right away....but the act itself is still illegal, and definitely not a risk the Admin is going to want to take.
Now, a dedicated "music" section for discussion of music is not a bad idea at all.