Graphic notation (music)
Graphic notation (or graphic score) is the representation of music through the use of visual symbols outside the realm of traditional music notation. Graphic notation became popular in the 1950s, and can be used either in combination with or instead of traditional music notation. Graphic notation was influenced by contemporary visual art trends in its conception, bringing stylistic components from modern art into music. Composers often rely on graphic notation in experimental music, where standard musical notation can be ineffective. Other uses include pieces where an aleatoric or undetermined effect is desired. One of the earliest pioneers  of this technique was Earle Brown, who, along with John Cage, sought to liberate performers from the constraints of notation and make them active participants in the creation of the music. Characteristics. Graphic notation is characterized by its variability and lack of standardization. According to "Baker's Student Encyclopedia of Music, Vol. 1", "Graphic notation is used to indicate extremely precise (or intentionally imprecise) pitch or to stimulate musical behavior or actions in performance." Modern graphic notation relies heavily on the imagination and inspiration of each individual performer to interpret the visual content provided by the composer. Because of this  relative freedom, the realization of graphically notated pieces usually varies from performance to performance. For example, in notation indication "E" of his piece "Concert for Piano and Orchestra", John Cage writes: "Play with hands indicated. Where clefs differ, a note is either bass or treble", an indeterminacy which is not unusual in Cage's work, and which leaves decision-making up to the performer. Some graphic scores can be defined as "action-based," where musical gestures are notated as shapes instead of conventional musical ideas. The use of graphic notation within a score can vary widely, from the score being  made up entirely of graphic notation to graphic notation being a small part of an otherwise largely-traditional score. Some composers include written explanations to aid the performer in interpreting the graphic notation, while other composers opt to leave the interpretation entirely up to the performer. Graphic notation is difficult to characterize with specificity, as the notation system is only limited by the imagination and ability of the composer. Though some composers, like John Cage, formulate graphic notation systems which unify the approach of specific pieces, or several pieces, there is no universal consensus on the parameters of graphic notation  and its use. History. Early history. Though its most popular usage occurred in the mid-twentieth century, the first evidence of graphic notation dates back much earlier. Originally called "eye music", these graphic scores bear much resemblance to the scores of composers like George Crumb. One of the earliest surviving pieces of eye music is "Belle, Bonne, Sage" by Baude Cordier, a Renaissance composer. His score, formed in the shape of a heart, was intended to enhance the meaning of the chanson. Characteristic of the Ars subtilior, "experimentations with mensural signs and graphic shapes and colours were often a feature  of musical design – for the sake of visual, rather than necessarily audible effect." Another example of eye music from the "ars subtilior" is Jacob Senleches' La harpe de melodie, where the voices are notated on a stave that appears to be the strings of a harp. Eye music's popularity died down after the Humanist movement of the mid-16th century, later to be revitalized in the twentieth century as the use of graphic scores became prominent once again. The 19th century music educator Pierre Galin developed a method of notating music known as the "Galin-Paris-Chevé" system, building off  of a method created in the 18th century by Jean-Jacques Rousseau. This system used numbers to indicate scale degrees, and used dots either above or below the note to indicate if they were in the lowest octave or the highest. The middle octave, relative to the example, contained no dots. Flats and sharps were notated using backslashes and forward slashes respectively. Prolongations of the note were notated using periods, and silence was notated with the number zero. This method was primarily used to teach sight-singing. The usage of symbols to indicate musical direction have been likened to an  early version of graphic notation. Uses in the twentieth century. Experimental music appeared in the United States and Europe during the 1950s, when many of the once untouchable parameters of traditional music began to be challenged. Aleatoric music, indeterminate music, musique concrète and electronic music shook previously unquestioned concepts, such as musical time or the function of the musician, and dared to add others to musical space in all its dimensions, with all their ontological consequences and burdens. They also changed the roles of the composer, the performer and the public, giving them totally new functions to explore. In this  context, the score, which had to a great extent been considered a mere support for musical writing (with the exception of eye music), began to flirt with the limits of the work and its identity. This marriage produced three paths: the first considered the musical score to be a representation of organized sound; the second conceived it as an extension of sound; and the third viewed it as another type of music, a visual music with its own autonomy, independent of sound. The score took on new meanings and went from being a mere support of sound to being an  extension of the work, or even another work altogether, an element that was as important as the sounds and silences it contained, or more. These conceptions required a new language and a new reading of what it is to be musical. They also required a new notation, one that would reflect the changes taking place in the second artistic vanguards, and contain them, granting them a new semantics. In this way, taken with the porousness of experimental music with respect to the plastic arts, notation came to be more and more influenced by a dialogue with painting, installations and performativity . As J.Y. Bosseur mentions in "La musique du XXè siècle à la croisé des artes", the score progressed towards representing the management of space, a graphic space that allows us to know the multiple connections enclosed within it. Graphic notation in its modern form first appeared in the 1950s as an evolution of movement of Indeterminacy as pioneered by John Cage. The technique was originally used by avant-garde musicians and manifested itself as the use of symbols to convey information that could not be rendered with traditional notation such as extended techniques. Graphic scores have, since their conception, evolved  into two broadly defined categories, one being the invention of new notation systems used to convey specific musical techniques and the other the use of conceptual notation such as shapes, drawings and other artistic techniques that are meant to evoke improvisation from the performer. Examples of the former include Morton Feldman's "Projection 1," which was the result of Feldman drawing abstract shapes on graph paper, and Stockhausen's "Prozession". Examples of the latter include Earle Brown's "December 1952" and Cornelius Cardew's "Treatise", which was written in response to Cage's "4'33"" and which he wrote after having  worked as Stockhausen's assistant. The score consists of 193 pages of lines and shapes on a white background. Here the lines represented elements in space and the score was merely a representation of that space at a given instant. In Europe, one of the most notable users was Sylvano Bussotti, whose scores have often been displayed as pieces of visual art by enthusiasts. In 1969, in an effort to promote the movement of abstract notation, John Cage and Allison Knowles published an archive of excerpts of scores by 269 composers with the intention of showing "the many directions in  which notation is now going". Other notable pioneers of graphic notation include composers such as Roman Haubenstock-Ramati, Mauricio Kagel, György Ligeti ("Artikulation"), Krzysztof Penderecki, Karlheinz Stockhausen, and Iannis Xenakis, Morton Feldman, Constance Cochnower Virtue, and Christian Wolff. Twenty-first-century advancements. In 2008, Theresa Sauer edited a compendium featuring graphic scores by composers from over fifty countries, demonstrating how widespread the practice has become. In addition to the more widespread popularity of graphic notation, new technology has expanded its possibilities. In his book "The Digital Score: Musicianship, Creativity, and Innovation", Craig Vear describes how Artificial Intelligence and animation can  be used to enhance the graphic score experience. He claims that these technologies are "the logical development of graphic score experiments from the latter part of the twentieth century. An interesting element of these is that they have to move in order for them to be read; without movement, they are unintelligible." Notable users. Other notable practitioners of graphic notation include: