The Copyright Act defines sound recordings as “works that result from the fixation of a series of musical, spoken, or other sounds but not including sounds accompanying a motion picture or other audiovisual work.” Generally, a sound recording is a recorded performance, often of another work. A sound recording must be fixed, meaning that the sounds must be captured in a medium from which they can be perceived, reproduced, or otherwise communicated. The author may fix the sounds in a digital track, disk, tape, or other format. Copyright in a sound recording is not the same as, or a substitute for, copyright in the underlying musical composition.