Have you been to the Internet Archive yet?
The Internet Archive is building a digital library of Internet sites and other cultural artifacts in digital form. Like a paper library, we provide free access to researchers, historians, scholars, and the general public.
Recent additions to the Archive include: recordings of Franklin Roosevelt and the Grateful Dead’s 1993 concerts. For example:
If you are not familiar with the Archive go check it out. and if you are then go try out some of this new material.