There has been an extraordinary amount of interest in sound spatialisation in recent years. The volume of work in this area has pushed many international organisations to feature sound spatialisation as a theme for conferences and publications, and Organised Sound is probably overdue in having a thematic issue based upon aspects of sound in space. This issue of Organised Sound contains many different views of space. We have included articles about spatialisation techniques, our understanding of sound spatialisation, composition, performance and spaces inside music as well as the spaces and environments where music can exist, including virtual spaces.

At a time when our sense of physical space is being radically challenged and modified by new global communication technologies, it seems not unusual that composers are taking a renewed interest in it. We have begun to experiment with using the new technologies available to us to move sound in space and create surround-sound environments.

For electroacoustic music and other soundscapes we have pan pots on our mixing desks and in our synthesizers to radially position sounds between loudspeakers, and reverberators to simulate the distance of sound sources from the listener. Dolby Digital 5.1 (AC-3) and DTS were introduced as competing standards for theatre sound recordings around 1992 and consumer products are available in both formats. In addition, Digital Versatile Discs (DVDs) are making sophisticated soundfield techniques such as Ambisonics both practical and more accessible.

This article traces some of my own explorations in the use of 3-space for musical composition, examines the limitations of basing structuring methodologies primarily on functional psychoacoustic studies of hearing, and suggests alternative approaches based on an understanding of 3-space from the work of the perceptual psychologist James Gibson.

The design and development of a layered Web architecture for Malaysian music can be applied as a model of Web architecture for music education, specifically for the introduction of the music of a particular country or region. The model is designed and developed in two phases: the building of the subject architecture and the design and development of the application architecture. The complete Web architecture is analysed and tested to determine its suitability for delivery of music-related content. Research findings indicate that the Web architecture is reliable, efficient and suitable for its purpose. The classification scheme proposed is found to provide a firm foundation for the building of the Web architecture. In conclusion, the prototype model provides a suitable extensible platform for the delivery of music content, which may be packaged for the purpose of education.

Sound diffusion – the realtime (usually manual) control of the relative levels and spatial deployment during performance – is one of the most contentious issues in the field of electroacoustic music. There are parts of the world where the practice is virtually unknown; in other places it is the norm and appropriate facilities would be provided as a matter of course for any visiting composer or performer. These ‘local variations’ are not merely ripples on the surface of a standardised performance practice but stem from underlying attitudes to what composition and performance in this medium are about and, ultimately, to a definition of music itself. What follows summarises observations drawn from fifteen years of working with the BEAST concert diffusion system in numerous performance spaces in the UK and Europe, as well as experiencing, both as listener and performer, other systems in Europe and North America. Scientific rigour, in the normally accepted sense of tables of measurements etc., is not my goal – my portable measuring equipment has been my ears, and my conclusions are based on what I have heard.

Vector base amplitude panning (VBAP) is a new method for soundscape creation. It generalises the pair-wise panning paradigm to the triplet-wise panning paradigm, which can be used in three-dimensional loudspeaker setups. Similar soundscapes can be created with differing numbers of loudspeakers in different positions. The VBAP implementation in Csound synthesis software presented in this paper is a powerful tool for producing generic soundscapes. Virtual sources are positioned by defining the virtual source directions as (azimuth, elevation) pairs; the loudspeaker setup is defined in the initial settings. Virtual sources can be moved in three different ways: they can be moved along a polyline between specified directions, angular velocities can be applied to them, or their directions can be controlled arbitrarily.

This paper seeks to examine how sound in general (and electroacoustic music in particular) can evoke a sense of being and place which may be strongly related to our visual experience. The auditory system has evolved to seek the reasons for the soundfield it encounters and this property cannot meaningfully be ignored by composers in this medium. The acousmatic condition stimulates and enhances this response. The science of acoustics cannot any longer alone explain sound phenomena and requires psychological and ecological dimensions. The idea of the ‘frame’ is developed from large-scale to small-scale soundfields: ‘landscape’, ‘arena’ and ‘stage’ are seen to be flexible components of this approach to composition. The paper concludes that a mature relationship of audio and visual art forms requires a greater acknowledgement of these attributes of sound.

Composition and diffusion can be understood as two complementary and related processes: bringing sounds together, and spreading them out again in an organised fashion. In the Western tradition, these two processes are frequently carried out by different people at different times, each drawing on specialised knowledge. The electroacoustic tradition, even if much briefer, offers the possibility of the composer designing and implementing both aspects of the music, and interrelating them in highly specific ways. Computer control offers the greatest precision in dealing with the complexities of these processes, even though, at present, separate programs are usually required.

Let us imagine a situation: a listener seated in a concert hall witnesses a performance by a trumpet player (standing on the stage) of a sequence of four quarter-notes, with the pitches of B[flat ]3–A3–C4–B3. The listener chooses to ignore the immediate physical surroundings and hears one of the following: (i) four trumpet sounds equally spaced in time, (ii) a sequence of intervals – minor second, minor third, minor second, (iii) an instance of set 4-1, (iv) a motive referring to the name of BACH. The `web of interpretants' (term from Nattiez 1987/1990) surrounding a simple musical fact is already quite dense, even though we have only considered its aspects relating to pitch, pitch class and pitch notation (representation by letters). What if the performer's gestures, the facial expressions, the direction of the bell of the instrument became important? Might one say, then, that the music has become theatre?

This article describes some of the basic principles of acoustics and psychoacoustics related to the spatialisation of sound. It introduces recording and diffusion technologies, including binaural, stereo and surround-sound techniques.