Sound spatialisation has a solid history in acoustic music, from Gabrieli’s antiphonal groups calling across St Mark’s Basilica in the 16th century, to Birtwistle’s formalised processionals in the 20th; and from the stage distribution of the instruments as spatial co-rider in Webern’s Klangfarbenmelodie, to off-stage fanfares of dramatic import in opera. I’ll review snapshots of some of these scenarios and their motivations, but my main object will be to illustrate some inherent limitations. One such limitation might be that the sound of a singer or instrumentalist can’t move quickly in space without some rather comedic stagecraft. Another is that the position of a sound is tied to the sonorities of the instrument or voice needed to make it.
Acousmatic music — the extended family of sound art that uses electronic means but no acoustic performers or things to see: music for listening — offers a different prospective. The material might be anything that can be recorded or created electronically, whereas the spatial location might be that of any loudspeaker(s) that can replay the material. Early recording media had technical limits of dynamic and spectral range and a single channel of audio. Sound diffusion, emerging with the new compositional practice from the 1950s onwards, offered a means to interpret and expand the implicit spaces and unfold their figurative or abstract import in the music through real-time and dynamically changing distribution in an orchestra of loudspeakers. This performance tradition has evolved into many branches, aided by constant evolution of technologies. Its possibilities fold back deeply into philosophies, expressive languages, theories and techniques of compositional practice. The shared key, for the kinds of music I am looking at today, is that spatial concerns are fundamental and intrinsic.
There are tensions, even contradictions. A few of the polarities one could mention concern individual listening (as composer in the studio, or as audience-listener) versus sharing in concert; an ideal of spatial content for perfect reproduction versus an ideal based on liveness and interpretation for the unique moment; an orchestra of individually characterful loudspeakers versus an array of shared neutral character; bespoke systems in the research community vs commercial imperatives and standards; and the pros, cons, claims and counterclaims for the various families of technical mechanism. Taken together, these make for challenges but also lots of stimulus. I will illustrate with a few examples from my own compositions and discuss the approaches we take and our current research directions with the Bristol University Loudspeaker Orchestra, BULO.
BULO’s next concert is the day after this presentation. After today’s preview in words, please come and hear the music! More about the event here: https://www.bristol.ac.uk/arts-law-social-sciences/events/2026/november/bristol-university-loudspeaker-orchestra.html