described as a type of self-therapy.” David N. Green, musician, writer and composer, wrote in 1987 an essay about musicians using screams as a singing technique in music. He makes the distinction between harmonic scream that relates to the harmony of the music and has components of tonality, the true scream that is atonal, the lyrical scream that is related with the song's lyrics and the pure scream that is not. The harmonic scream is the scream that is still very clear and has a defined pitch and that, according to Green, can actually be related to a fake scream; as it has no great disturbance, the lyrical scream that is related to words, most of the time swearing and the pure scream or the true scream, that in this case can also be called as the real scream or the primal scream. Scream in music can also be seen in other ways than just a vocal action. Many musicians use scream as an inspirational source for their playing with instruments. This is usually represented in a loud hit on the instrument's chords, in the case of the instruments that have chords, or a loud striking note, on the blowing instruments. Sound art Pressure of the unspeakable is a radio feature work by Gregory Whitehead. Initiated in 1991 the project started with the founding of the Institute of the Screamscape studies where people were asked through radio and television to call on a hot line and scream. Whitehead notes: “In addition to framing the nervous system, the telephone-microphone-tape-recorder-radio circuitry also provided the key for the acoustic demarcation of pressure in the system: distortion, the disruption of digital codes, pure unmanageable noise. The scream as an eruption in excess of prescribed circuitries, as capable of “ blowing” communications technologies not designed for such extreme and unspeakable meanings”. Whitehead gathered slowly an archive of screams that was edited and resulted in a theoretical narrative radio feature. Allen S. Weiss notes about his work that “the screamscape lies beyond any possible determination of authenticity”. The people's vociferations are just manifestations that through their anonymity create a sense of togetherness. Theater Actors are taught from the beginning of their careers how to scream correctly. They learn how to awaken that uncomfortable feeling in the listener without necessarily having to have any psychological attachment. Antonin Artaud Antonin Artaud's' last written work To have done with