The Discography of American Historical Recordings (DAHR) is a database catalog of master recordings made by American record companies during the 78rpm era.[1] The 78rpm era was the time period in which any flat disc records were being played at a speed of 78 revolutions per minute.[2] The DAHR provides some of these original recordings, free of charge, via audio streaming,[1] along with access to the production catalogs of those same companies. DAHR is part of the American Discography Project (ADP), and is funded and operated in partnership by the University of California, Santa Barbara, the National Endowment for the Humanities,[3] and the Packard Humanities Institute.[4]