The ever-increasing focus on sound in recent creative practices has ideological implications and seems to reframe and problematise ontological perspectives on music. Today it is possible to contrast notions of music as identical with sound (as in the discursive framework of ‘audio culture’) with artistic practices where sound and music are not at all identical, and the usually implicit hierarchy between them is probably twisted. This article discusses such matters from a methodological position that weaves together issues usually discussed in different areas of concern: it understands ecologically informed notions of sound and auditory experience as strictly intertwined with critical and inventive attitudes on technology, particularly as their intertwining is elaborated through performative practices. It suggests that, in music as well as in sound art, what we hear as sound and in sound is the dynamics of an ecology of situated and mediated actions, as a process that binds together (1) human beings (practitioners and listeners, their auditory inclinations), (2) technical agencies (the domain where means and ends are dialectically negotiated as practitioners strive to achieve a certain freedom in action across the public space of technological mediations and delegations) and (3) the environment (the physical and cultural context where sound-making and listening practices take place). The general idea is that the manners by which we shape up our relationship to sound and appropriate the technical mediations involved in working with it, are of biopolitical relevance for social endeavours that might (still) be ‘music’

In this paper I describe a work of mine, Background Noise Study, as a starting point to raise questions of broader relevance for current artistic practices. Issues are presented in terms varying from technical and specific, to more philosophical and general (system-theory, biocybernetics, ecology). Excursions are made into the music-theoretical (understanding of key issues in the sound arts, such as ‘space’, ‘performance’, ‘form’ or ‘timbre’) and the political (politics of sound, biopolitics of performance and listening).

This paper takes a systemic perspective on interactive signal processing and introduces the author's Audible Eco-Systemic Interface (AESI) project. It starts with a discussion of the paradigm of ‘interaction’ in existing computer music and live electronics approaches, and develops following bio-cybernetic principles such as ‘system/ambience coupling’, ‘noise’, and ‘self-organisation’. Central to the paper is an understanding of ‘interaction’ as a network of interdependencies among system components, and as a means for dynamical behaviour to emerge upon the contact of an autonomous system (e.g. a DSP unit) with the external environment (room or else hosting the performance). The author describes the design philosophy in his current work with the AESI (whose DSP component was implemented as a signal patch in KYMA5.2), touching on compositional implications (not only live electronics situations, but also sound installations).

Working on Analogique B in the late 1950s, Xenakis formulated the ‘hypothesis of a second order sonority’. This paper focuses on this concept, and shows its crucial meaning in the composition of a number of pieces, such as Concret PH, Analogique B and the very recent Gendy3 and S709. The perspective taken is twofold: on one side, the problem of 2nd-order sonorities is seen as a problem in modelling perceptual attributes (or timbre) of sound in terms of ‘emergent properties of organised sound structure’. This is also related to the composer’s pioneering work with granular sound representations and nonstandard methods of sound synthesis. On the other, the issue is discussed in conjunction with Xenakis’ attempt at implementing thoroughly formalised ‘mechanisms’ or ‘systems’ based on the mathematics of stochastic processes. The paper shows that the issue touched on here is essential to the aesthetics of Xenakis’ electroacoustic music. It also questions whether the formalisation of stochastics is a suitable means to let 2nd-order sonorities emerge from the internal life of the sound matter. The limitations of Xenakis’ ‘mechanisms’ are described in terms of their cybernetics, and are situated in the context of artistic and scientific paradigm shifts concerning the relationship between order, disorder and chaos.