Max - It seems like the worst-case scenario would be that you'd have to remove from the site lyrics for which you don't have written permission to post. (Since I contributed Loreena McKennitt's "All Soul's Night" without thinking about whether that was OK or not, I'm feeling partially responsible for this.) But that would mean removing those lyrics from Dick and Susan's database and the forum - what a pain. Still, if distributing those lyrics without permission is a copyright infringement, I don't see what choice we have.
I can just imagine the furtive nature of future requests for lyrics: "Does anyone have the lyrics to "I'm a Lumberjack and I'm OK"? DON'T POST THEM, they may be copyrighted, just leave them in the hollow tree at the intersection of Route 66 and 151. Thanks."
Anyway, the request for more specifics seems like the best course right now. They may be just fishing. Hang in there.