This May, the Library of Congress started streaming some of America’s oldest recorded music on its new National Jukebox website, which features more than 10,000 audio tracks produced by the Victor Talking Machine Company between 1901 and 1925. Among the offerings: John Philip Sousa marches, early Tin Pan Alley rags, Black Broadway tunes, Irving Berlin numbers, and Enrico Caruso arias. See www.loc.gov/jukebox.