U.S. Copyright law
|“||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.||”|
A phonorecord generally embodies two works — a musical work (or, in the case of spoken word recordings, a literary work) and a sound recording. Musical works available online may also be the subject of Musical Instrument Digital Interface ("MIDI") recordings.