Defined in technical language, spectral music is an acoustic musical practice where compositional decisions are often informed by sonographic representations and mathematical analysis of sound spectra, or by mathematically generated spectra. The spectral approach focuses on manipulating the spectral features, interconnecting them, and transforming them. In this formulation, computer-based sound analysis and representations of audio signals are treated as being analogous to a timbral representation of sound.
The (acoustic-composition) spectral approach originated in France in the early 1970s, and techniques were developed, and later refined, primarily at IRCAM, Paris, with the Ensemble l'Itinéraire, by composers such as Gérard Grisey and Tristan Murail. Hugues Dufourt is commonly credited for introducing the term musique spectrale (spectral music) in an article published in 1979. Murail has described spectral music as an aesthetic rather than a style, not so much a set of techniques as an attitude; as Joshua Fineberg puts it, a recognition that "music is ultimately sound evolving in time".Julian Anderson indicates that a number of major composers associated with spectralism consider the term inappropriate, misleading, and reductive. The Istanbul Spectral Music Conference of 2003 suggested a redefinition of the term "spectral music" to encompass any music that foregrounds timbre as an important element of structure or language.
Julian Anderson considers Danish composer Per Nørgård's Voyage into the Golden Screen for chamber orchestra (1968) to be the first "properly instrumental piece of spectral composition". Spectralism as a recognizable and unified movement, however, arose during the early 1970s, in part as a reaction against and alternative to the primarily pitch focused aesthetics of the serialism and post-serialism which was ascendant at the time.[a] Early spectral composers were centered in the cities of Paris and Cologne and associated with the composers of the Ensemble l'Itinéraire and the Feedback group, respectively. In Paris, Gérard Grisey and Tristan Murail were the most prominent pioneers of spectral techniques; Grisey's Espaces Acoustiques and Murail's Gondwana were two influential works of this period. Their early work emphasized the use of the overtone series, techniques of spectral analysis and ring and frequency modulation, and slowly unfolding processes to create music which gave a new attention to timbre and texture.
Towards the end of the twentieth century, techniques associated with spectralist composers began to be adopted more widely and the original pioneers of spectralism began to integrate their techniques more fully with those of other traditions. For example, in their works from the later 1980s and into the 1990s, both Grisey and Murail began to shift their emphasis away from the more gradual and regular process which characterized their early work to include more sudden dramatic contrasts as more well linear and contrapuntal writing. Likewise, spectral techniques were adopted by composers from a wider variety of traditions and counties, including the UK (with composers like Julian Anderson and Jonathan Harvey), Finland (composers like Magnus Lindberg and Kaija Saariaho), and the United States. A further development is the emergence of "hyper-spectralism"[clarification needed] in the works of Iancu Dumitrescu and Ana-Maria Avram.
The spectral adventure has allowed the renovation, without imitation of the foundations of occidental music, because it is not a closed technique but an attitude. —Gérard Grisey
The "panoply of methods and techniques" used are secondary, being only "the means of achieving a sonic end".
Spectral music focuses on the phenomenon and acoustics of sound rather than its potential semantic qualities. Pitch material and intervallic content are often derived from the harmonic series, including the use of microtones. Spectrographic analysis of acoustic sources is used as inspiration for orchestration. The reconstruction of electroacoustic source materials by using acoustic instruments is another common approach to spectral orchestration. In "additive instrumental synthesis", instruments are assigned to play discrete components of a sound, such as an individual partial. Amplitude modulation, frequency modulation, difference tones, harmonic fusion, residue pitch, Shepard-tone phenomena, and other psychoacoustic concepts are applied to music materials.
Formal concepts important in spectral music include process and the stretching of time.[further explanation needed] Though development is "significantly different from those of minimalist music" in that all musical parameters may be affected, it similarly draws attention to very subtle aspects of the music. These processes most often achieve a smooth transition through interpolation. Any or all of these techniques may be operating in a particular work, though this list is not exhaustive.
The Romanian spectral tradition focuses more on the study of how sound itself behaves in a "live" environment. Sound work is not restricted to harmonic spectra but includes transitory aspects of timbre and non-harmonic musical components (e.g., rhythm, tempo, dynamics). Furthermore, sound is treated phenomenologically as a dynamic presence to be encountered in listening (rather than as an object of scientific study). This approach results in a transformational musical language in which continuous change of the material displaces the central role accorded to structure in spectralism of the "French school".
Spectral music was initially associated with composers of the French Ensemble l'Itinéraire, including Dufourt, Gérard Grisey, Tristan Murail, and Michaël Lévinas. For these composers, musical sound (or natural sound) is taken as a model for composition, leading to an interest in the exploration of the interior of sounds.Giacinto Scelsi was an important influence on Grisey, Murail and Lévinas; his approach with exploring a single sound in his works and a "smooth" conception of time (such as in his Quattro pezzi su una nota sola) greatly influenced these composers to include new instrumental techniques and variations of timbre in their works.
Independent of spectral music developments in Europe, American composer James Tenney's output included more than fifty significant works that feature spectralist traits. His influences came from encounters with a scientific culture which pervaded during the postwar era, and a "quasi-empiricist musical aesthetic" from John Cage. His works, although having similarities with European spectral music, are distinctive in some ways, for example in his interest in "post-Cageian indeterminacy".
^"... the question of timbre, though it is rigorously tackled by Schönberg (in his theory of the "melody of timbres") and above all by Webern, nevertheless has pre-serial origins, especially in Debussy—in this regard a "founding father" of the same rank as Schönberg. ... Later, it also provided the grounds for the break with Boulez's "structural" orientations and the contestation of the legacy of serialism which was carried out by the French group L'Itinéraire (Gérard Grisey, Michaël Lévinas, Tristan Murail ...)" (Badiou 2009, 82).
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