The Library of Congress is using the Internet to provide free, online access to thousands of the nation’s oldest sound recordings. The National Jukebox went online this month. It hosts more than 10,000 historical music and spoken word recordings made between 1901 and 1925. Users can select and stream the recordings at LOC.gov/jukebox. For the time being, the recordings are from the catalogs of Columbia and Victor, the two oldest record companies in the world.