Congressional Research Reports prepared by staff of the LC Congressional Research Service provide an overview of topics being addressed by the U.S. Congress. You may have been using these reports through CQ Researcher. This service includes reports that have been made available by members of Congress, so does not include everything. These appear to be available through googlescholar. zFACTS is another way to get at them.
Free and open access to written and spoken words, sound recordings, still and moving images, prints, maps, and sheet music that document the American experience. http://memory.loc.gov/ammem/index.html
Historical sound recordings available to the public free of charge from the extraordinary collections of the Library of Congress Packard Campus for Audio Visual Conservation and other contributing libraries and archives. http://www.loc.gov/jukebox/
Using the Library of Congress
To use the Library of Congress in person, start with the "Information for Researchers" page. Check out their extensive digital collections from the home page and be sure to follow the links to other resources such as the American Folklife Center and World Digital Library.