sentences:  Users sign this document before listening to an oral history recording in order to demonstrate that they understand and have agreed to the usage restrictions put in place by the institution.Early methods of recording sound included phonograph cylinders (a stylus would draw wax grooves on the outside of a cylinder), gramophone records (grooves on the flat side of a disk) and magnetic recordings.While reel-to-reel audio tape recordings are still used, video recordings have become standard.