I think M.Ted is right; it looks like a trawling exercise by greedy lawyers who are acting on their own behalf in the hope of cornering what they hope might become a lucrative market. If required to specify what material is at issue, they might just disappear; I doubt if they actually know. That said, the U.S legal system is a bit of a mystery to those of us who live in other countries not (yet) subject to it, so clearly this has to be taken seriously. It's true that there are songs on the database which are not credited to their writers, but there are probably a lot more that are credited to people who have simply claimed a copyright to which they have no moral entitlement. In the latter case, an alternative version could be substituted. Meanwhile, I shall send a contribution to the fighting fund just as soon as I can make the form work for me! Good luck,

Malcolm Douglas