Some psychics write music that they believe has been sent to them by dead composers. This skill (clairaudience) is often used in psychometry, for instance when wandering round old buildings, a clairaudient may hear snatches of a favourite song or voices, or walking across an old battlefield, they may hear the sound of weapons clashing.
Some people hear voices quite distinctly. This can be alarming as in our culture hearing voices is generally believed to be a bad thing, indicative of mental illness. However, unless the voices are urging destructive or negative behaviour, then they may be instances of ESP. Mediums exercise this skill when they hear messages from spirits.
Some people have clairaudient experiences in the form of voices of someone they have known, or a voice they don't recognise, others don't recognise their psychic ability initially as the messages just sound like them thinking to themselves. It is believed that area of the brain just above the ears is processing the information for clairaudient experiences. This is where sounds perceived through the ears are interpreted as well as ESP information.
Mediums with this faculty hear the voices of spirit people as distinct as though the person is in the flesh. When a medium is in the habit of talking to one particular communicator, they immediately recognise the characteristics of that voice.