“‘Phonorecords’ are material objects in which sounds, other than those accompanying a motion picture or other audiovisual work, are fixed by any method now known or later developed, and from which the sounds can be perceived, reproduced, or otherwise communicated, either directly or with the aid of a machine or device. The term ‘phonorecords’ includes the material object in which the sounds are first fixed.” 17 U.S.C. § 101.