Stan Getz Library has plenty of resources you can access even when the library's doors are closed, but we are not the only library with a remotely-accessible collection. The Library of Congress has just announced the launch of the National Jukebox, with streaming audio of historical sound recordings made between 1901 and 1925.
If old stuff sounds boring, don't worry. The player includes the disclaimer, "WARNING: Historical recordings may contain offensive language." We do not have a monopoly on offensive language in modern times.