Experimental music is a general label for any music or music genre that pushes existing boundaries and genre definitions. Experimental compositional practice is defined broadly by exploratory sensibilities radically opposed to, and questioning of, institutionalized compositional, performing, and aesthetic conventions in music. Elements of experimental music include indeterminacy, in which the composer introduces the elements of chance or unpredictability with regard to either the composition or its performance. Artists may approach a hybrid of disparate styles or incorporate unorthodox and unique elements.
The practice became prominent in the mid-20th century, particularly in Europe and North America. John Cage was one of the earliest composers to use the term and one of experimental music's primary innovators, utilizing indeterminacy techniques and seeking unknown outcomes. In France, as early as 1953, Pierre Schaeffer had begun using the term musique expérimentale to describe compositional activities that incorporated tape music, musique concrète, and elektronische Musik. In America, a quite distinct sense of the term was used in the late 1950s to describe computer-controlled composition associated with composers such as Lejaren Hiller. Harry Partch and Ivor Darreg worked with other tuning scales based on the physical laws for harmonic music. For this music they both developed a group of experimental musical instruments. Musique concrète is a form of electroacoustic music that utilises acousmatic sound as a compositional resource. Free improvisation or free music is improvised music without any rules beyond the taste or inclination of the musician(s) involved; in many cases, the musicians make an active effort to avoid clichés; i.e., overt references to recognizable musical conventions or genres.
Definitions and usage
Origins
The Groupe de Recherches de Musique Concrète (GRMC), under the leadership of Pierre Schaeffer, organized the First International Decade of Experimental Music between 8 and 18 June 1953. This appears to have been an attempt by Schaeffer to reverse the assimilation of musique concrète into the German elektronische Musik, and instead tried to subsume musique concrète, elektronische Musik, tape music, and world music under the rubric "musique experimentale". Publication of Schaeffer's manifesto was delayed by four years, by which time Schaeffer was favoring the term "recherche musicale" (music research), though he never wholly abandoned "musique expérimentale".
John Cage was also using the term as early as 1955. According to Cage's definition, "an experimental action is one the outcome of which is not foreseen", and he was specifically interested in completed works that performed an unpredictable action. In Germany, the publication of Cage's article was anticipated by several months in a lecture delivered by Wolfgang Edward Rebner at the Darmstädter Ferienkurse on 13 August 1954, titled "Amerikanische Experimentalmusik". Rebner's lecture extended the concept back in time to include Charles Ives, Edgard Varèse, and Henry Cowell, as well as Cage, due to their focus on sound as such rather than compositional method.
Alternative classifications
Composer and critic Michael Nyman starts from Cage's definition, and develops the term "experimental" also to describe the work of other American composers (Christian Wolff, Earle Brown, Meredith Monk, Malcolm Goldstein, Morton Feldman, Terry Riley, La Monte Young, Philip Glass, Steve Reich, etc.), as well as composers such as Gavin Bryars, John Cale, Toshi Ichiyanagi, Cornelius Cardew, John Tilbury, Frederic Rzewski, and Keith Rowe. Nyman opposes experimental music to the European avant-garde of the time (Boulez, Kagel, Xenakis, Birtwistle, Berio, Stockhausen, and Bussotti), for whom "The identity of a composition is of paramount importance". The word "experimental" in the former cases "is apt, providing it is understood not as descriptive of an act to be later judged in terms of success or failure, but simply as of an act the outcome of which is unknown".
David Cope also distinguishes between experimental and avant-garde, describing experimental music as that "which represents a refusal to accept the status quo". David Nicholls, too, makes this distinction, saying that "...very generally, avant-garde music can be viewed as occupying an extreme position within the tradition, while experimental music lies outside it".