I seem to recall that there used to be a huge archive of old blues lyrics somewhere on the net. I've been trying to google, but I can't find it. Any ideas?

I'm particularly interested for copyright reasons. I want to be able to show that some blues and similar songs that are familiar from recordings made in the mid-20th century onwards, credited to artists who are either still alive or have been dead for less than 70 years, have roots that go back further. That means that related songs performed now are free of copyright claims.