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This article was downloaded by: [University of Melbourne] On: 29 April 2009 Access details: Access Details: [subscription number 731852009] Publisher Routledge Informa Ltd Registered in England and Wales Registered Number: 1072954 Registered office: Mortimer House, 37-41 Mortimer Street, London W1T 3JH, UK Journal of New Music Research Publication details, including instructions for authors and subscription information: http://www.informaworld.com/smpp/title~content=t713817838 Spatial sound movement in the instrumental music of Iannis Xenakis Maria Anna Harley a a Faculty of Music, McGill University, Montreal, Que., Canada Online Publication Date: 01 September 1994 To cite this Article Harley, Maria Anna(1994)'Spatial sound movement in the instrumental music of Iannis Xenakis',Journal of New Music Research,23:3,291 — 314 To link to this Article: DOI: 10.1080/09298219408570661 URL: http://dx.doi.org/10.1080/09298219408570661 PLEASE SCROLL DOWN FOR ARTICLE Full terms and conditions of use: http://www.informaworld.com/terms-and-conditions-of-access.pdf This article may be used for research, teaching and private study purposes. Any substantial or systematic reproduction, re-distribution, re-selling, loan or sub-licensing, systematic supply or distribution in any form to anyone is expressly forbidden. The publisher does not give any warranty express or implied or make any representation that the contents will be complete or accurate or up to date. The accuracy of any instructions, formulae and drug doses should be independently verified with primary sources. The publisher shall not be liable for any loss, actions, claims, proceedings, demand or costs or damages whatsoever or howsoever caused arising directly or indirectly in connection with or arising out of the use of this material. Journal of New Music Research, Vol. 23 (1994), pp. 291-314 0929-8215/94/2303-291$6.00 © Swets & Zeitlinger Spatial Sound Movement in the Instrumental Music of Iannis Xenakis Maria Anna Harley ABSTRACT This paper discusses spatial sound movement in Xenakis's music from Pithoprakta (1955-56) to Alax (1985). Evolution of stochastic sound masses in Pithoprakta is linked to a rudimentary form of motion of sound on the stage. Eonta (1963-64) explores performer movement and the directional quality of brass instruments (e.g., change of timbre through axial rotations of the players). In Terretektorh (1965-66), for orchestra scattered among the audience, apparent sound motion is constructed by means of Archimedean, logarithmic and hyperbolical spirals. The climax of Perse- phassa (1969) consists of several superimposed layers of sound, rotating simul- taneously in different directions. Alax (1985) for three identical ensembles, presents spatial canons, sound planes, etc. Xenakis's original use of spatial sound movement in music juxtaposes technical sophistication with an overwhelming forcefulness of expression. 1. INTRODUCTION Musical movement is usually equated with motion in time which is present in the relationship of succession and the teleological orientation between events of a fixed order. According to Eduard Hanslick, "the attribute of motion, of sequential development" (Hanslick 1854/1986: 29) is a basic characteristic of the musical Downloaded By: [University of Melbourne] At: 09:55 29 April 2009 phenomenon. Yet, in many works of this and the previous century, musical move- ment occurs both in time and in space, and the spatial placement of sound is given compositional significance. The contrasts of distance — from being far away to near — are explored, for example, in the Finale of Gustav Mahler's Symphony No. 2 (1893—1894; cf. Mitchell 1975). The apparent motion of sound from the front to the back of the hall (and vice versa) is a basic feature of Henry Brant's Millennium II (1954), where it is created by successive entries of the trumpets and trombones placed along the walls of the hall (Drennan 1975). The vertical direction of motion from high to low may be articulated by the alternation between groups of instru- ments placed in a high gallery and on the ground level of the church, as in John Tavener's Ultimos Ritos (1972; cf. Harley 1993). Finally, the movement of sound 292 MARIA ANNA HARLEY around the audience may be circular, as in Pierre Boulez's Reports (1981—1988) for 6 instrumental soloists (surrounding the audience), instrumental ensemble (in the midst of the audience) and electroacoustic equipment (including two sets of 6 loudspeakers on the outskirts of the performance area). Spatial sound movement may be discrete, that is, it may proceed stepwise — if a musical phrase is presented successively in one ensemble of performers after another. This technique has been known since the Venetian school of polychorality in the late renaissance (or even earlier, cf. Carver 1988). Sound movement in space may also assume a continuous form — realized with moving performers or march- ing bands, for example. Such continuous motion may also be imitated by means of dynamics in music played by stationary performers — as in Charles Ives's Symphony No. 4 (1909—1916, movement II). A different method of creating a continuous movement of sound in space has been introduced in the second half of the 20th century. This technique involves ensemble dispersion, dynamic shading and temporal overlapping of sounds: station- ary instrumental groups are placed around the audience and successively play sounds of the same pitch and timbre with similar dynamic envelopes (crescendo- decrescendo). The sound seems to rotate in space, gradually shifting from one instrumental ensemble to another. The perception of this effect is very fragile; it depends on the position of the listener and the quality of performance, that is, the placement of the groups, the exact matching of pitch, timbre, dynamics and so forth. This effect, first used in Karlheinz Stockhausen's Gruppen fur Drei Orchester (1955—57; Harley 1993), appears, for instance, in Stockhausen's Carre for four orchestras and choirs (1959—60), Kazimierz Serocki's Continuum for six percussionists (1965—66) as well as in several compositions by Xenakis — the subject of this article. Xenakis's music, from Pithoprakta (1956) and Eonta (1963-64) to Alax (1985), features various forms of spatial sound movement. A particular emphasis is given in this study to two compositions: Terretektorh for 88 musicians scattered among Downloaded By: [University of Melbourne] At: 09:55 29 April 2009 the audience (1965—66) and Persephassa for 6 percussionists encircling the audience (1969). The analysis of Xenakis's music is supported by an examination of his compositional sketches and a review of his ideas as presented in Formalized Music (Xenakis 1971) as well as in a recent interview with the author (Xenakis 1992). The composer's continuing interest in the technique of spatialization is not limited to the instrumental works listed above. Different aspects of spatial sound are explored in Polytope de Montreal for 4 identical orchestras (1967), the musical component of Xenakis's audiovisual installation at EXPO 67 in Montreal. This work is the first in Xenakis's Polytope series, multimedia presentations which explore space (and time) by means of sound and light in movement (cf. Revault d'Allonnes 1975). In Nomos Gamma for 98 musicians scattered among the SOUND MOVEMENT IN MUSIC OF IANNIS XENAKIS 293 audience (1967—1968) mathematical group theory is used to structure the spatial placement of sound. Multichannel sound projection is required in a variety of Xenakis's electroacoustic compositions, including Bohor with its monumental sound masses (1962), and La Legende d'Eer (1977) with its complex patterns of sound movement in time, space, pitch and timbre. Xenakis's interest in electroacoustic music dates back to 1956, when he began working with Le Corbusier on the Philips Pavilion for EXPO 1958. In the Pavilion, 425 loudspeakers were used to obtain an effect of continuous sound movement in various directions (Wehmeyer 1977: 164). This sound projection system was con- structed for performances of Edgar Varese's Poeme electronique, preceded by Xenakis's earliest well-known electroacoustic work, Concrete PH (1958). This incandescent prelude, in which the sounds of burning charcoal create a scintillating texture with changing density and timbre, prefigures essays in granular synthesis of recent computer music. The experience with electroacoustics was not without consequences for Xenakis's role in the development of the technique of continuous, spatial sound movement in instrumental music (Terretektorh, Nomos Gamma and Persephassa). The very idea of using superimposed dynamic envelopes and temporal shifts to cause continuous changes in the apparent position of instrumental sounds was modelled on an electroacoustic technique, that is, stereo sound projection. In stereophony, differences of intensity between identical signals from two separate channels (loudspeakers) lead to changes in the location of virtual sound sources. Xenakis's describes this in the following way: Let us say that we have a monophonic recording of one sound and we want to make this sound move from loudspeaker A to loudspeaker B when the two are separated spatially. In order to do so we need to use two potentiometers, one for each channel, opening potentiometer A then closing it while slowly increasing the level in channel B. The balance is very sensitive; the most Downloaded By: [University of Melbourne] At: 09:55 29 April 2009 difficult thing is to have the sound coming from the center between the loudspeakers. This is just a simple example; in reality, sound movements are usually more complex and depend on the architecture of the performance space, the position of the speakers and many other things. When you want to re- produce such a complicated phenomenon with live musicians playing one after another with amplitude changing in the same way that you change the levels in a stereo sound projection, sometimes it will work and sometimes it will not. It depends on the speed of the sound as well as on the angle of two loudspeak- ers or musicians, that is, on the relative position of the listener.