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In electronic music theory and electronic composition theory a sound object (coined by Pierre Schaeffer 1959, 1977, p. 95) corresponds with a primary unit of music such that could be played on an instrument or sung by a vocalist. A sound object specifically refers to recorded sound rather than written music using manuscript or a score. More precisely, in his book Traité des objets musicaux Schaeffer considers the sound object in these terms:
This unit of sound [sound-object] is the equivalent to a unit of breath or articulation, a unit of instrumental gesture. The sound object is therefore an acoustic action and intention of listening. This unit of sound [sound-object] is the equivalent to a unit of breath or articulation, a unit of instrumental gesture. The sound object is therefore an acoustic action and intention of listening.
Schaeffer believed that the sound object should be free from its sonic origin (its sound source, or source bonding) so that a listener could not identify it. This type of sound object forms part of what Schaeffer called acousmatic music, which involved a reduced listening, or concentrated listening.
Schaeffer went through an evolution of thought with regard to his work with recorded material/ sound as music.
Schaeffer's ultimate aim in his Treatise is to re-define the music object in the light of the new technology of recording, he feels it necessary to first describe, what he claims is an empirical function/s of listening. Schaeffer's terminology is confused and confusing in this aspect as he uses listening, hearing, perceiving aurally and understanding under the sub-heading 'listening'. So one needs to a grasp of his descriptions of what it all means, and try to avoid being confused by his prodigal writing style.
Schaeffer's four functions of the "What Can be Heard." (pp. 74-79):
1) A sonic entity is detected by its signal being picked up by the autonomous mechanism of hearing (ouïr)
2) The signalled sonic entity (having been detected) 'sound character' is deciphered by the active perception of listening (éncouter)
3) The signalled sonic entity is then subjected to a twofold focussed attention that judges then describes it
4) The signalled sonic entities' significance is then is then understood by abstraction, comparison, deduction and by linking it to different sources and types (either the initial meaning is confirmed or if denied an additional meaning is worked out.
These are then extrapolated into "Four Listening Modes" (p.
"To give a quite empirical description of "what happens" when we listen, we will make a sort of summary of the various forms of activity of the ear." (p. 80)
This leads to the acousmatic situation, as Schaeffer describes it. Under Schaeffer the acousmatic situation is focussed on the subjective "listening itself which becomes the phenomena under study" rather than the object sound source. Pierre Schaeffer's contribution to the theory of the sound object is significant and as a result it's difficult to ascertain the impact of his influence, but as Brian Kane, in his book Sound Unseen says:
"In explicating and clarifying his theory of the sound object, Schaeer introduced the concept of the acousmatic. “e sound object,” Schaeer tersely states, “is never revealed clearly except in the acousmatic experience.”13 In what follows, I try to show why this is indeed the case. To do so, I will explicate Schaeer’s mature theory of acousmatic experience, the sound object, and reduced listening (écoute réduite) as presented in the Traité des objets musicaux. is theory is cast in explicitly phenom- enological terms, and I argue that Schaeer’s phenomenology is much closer to Husserl than it is to Schaeer’s French contemporary, Maurice Merleau-Ponty.14 For without a good understanding of the Husserlian preoccupations of Schaeer’s work, one cannot adequately characterize the relationship between acousmatic experi- ence, the sound object, and reduced listening. Once those various parts of Schaeer’s mature theory have been distinctly separated, the theory and practice of acousmatic listening—the real focus of interest in this book—can begin to be addressed."
A broader, or perhaps looser, interpretation of the term "sound object" takes any sound within a stipulated temporal limit, such as that proposed by Curtis Roads in 2001 in his book Microsound, where he says:
"1. Infinite The ideal time span of mathematical durations such as the infinite sine waves of classical Fourier analysis.
2. Supra A time scale beyond that of an individual composition and extending into months, years, decades, and centuries.
3. Macro The time scale of overall musical architecture or form, measured in minutes or hours, or in extreme cases, days.
4. Meso Divisions of form. Groupings of sound objects into hierarchies of phrase structures of various sizes, measured in minutes or seconds.
5. Sound object A basic unit of musical structure, generalizing the traditional concept of note to include complex and mutating sound events on a time scale ranging from a fraction of a second to several seconds.
6. Micro Sound particles on a time scale that extends down to the threshold of auditory perception (measured in thousandths of a second or milli-seconds).
7. Sample The atomic level of digital audio systems: individual binary samples or numerical amplitude values, one following another at a fixed time interval. The period between samples is measured in millionths of a second (microseconds).
8. Subsample Fluctuations on a time scale too brief to be properly recorded or perceived, measured in billionths of a second (nanoseconds) or less.
9. InfinitesimalThe ideal time span of mathematical durations such as the infinitely brief delta functions."
Roads, C., (2004, p.3)
Roads, therefore, places the sound object in a seemingly all encompassing temporal frame, whereby it may be considered one of nine scales of time. English composer Trevor Wishart derives his own version of sound object from Schaeffer's, but unlike Schaeffer Wishart favours a materialist or physicalist notion, saying:
Given that we have established a coherent aural image of a real acoustic space, we may then begin to position sound-objects within the space. Imagine for a moment that we have established the acoustic space of a forest (width represented by the spread across a pair of stereo speakers, depth represented by decreasing amplitude and high-frequency components and increasing reverberation) then position the sounds of various birds and animals within this space.
Another post-Schaefferian theory about sound objects is by Denis Smalley who has devised, what he describes as, 'spectromorphology’, (Smalley, 1997) a tool for analysing, and shaping sound objects, he states:
"I have developed the concepts and terminology of spectromorphologyas tools for describing and analysing listening experience… A spectromorphological approach sets out spectral and morphological models and processes, and provides a framework for understanding structural relations and behaviours as experienced in the temporal flux of the music." 
An important aspect of spectromorphology is, what Smalley calls ‘source bonding’, which he describes as the duality of any given listening situation. According to Smalley, therefore, sound objects have an extrinsic nature if its source bonding remains intact, but if not, it has a sonic characteristic that is intrinsic in nature. The condition in which a sound object has an intrinsic or extrinsic source bonding depends on the experiences of the listener. References
- Schaeffer, Pierre (2002). Traité Des Objets Musicaux: Essai Interdisciplines (in French). Paris: Éditions du Seuil. p. 271. ISBN 978-2-02-002608-6. OCLC 751268549.
- Stace, Constantinou (2015). "Processes of creative patterning : a compositional approach". Cite journal requires
- Schaeffer, North & Dack, Pierre, Christine, John (2017). Treatise on Musical Objects: An Essay across Disciplines. California: University of California. p. 65. ISBN ISBN: 9780520294301 Check
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- Kane, Brian (2014). Unseen Sound. Acousmatic Sound in Theory and Practice. Oxford: Oxford University Press. p. 17. ISBN 978–0–19–934784–1 (hardback) — ISBN 978–0–19–934787–2 (online content) Check
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- Roads, Curtis (2004). Microsound. London: MIT Press. p. 3.
- Wishart, Trevor (1996). On Sonic Art. Amsterdam: Harwood. p. 146. ISBN 3-7186-5847-X.
- Smalley, Denis. "Spectromorphology: explaining sound-shapes". Organised Sound. volume 2, (No. 2): 107–126 – via Cambridge, Cambridge University Press.
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Schaeffer, P. (2002) Traité des objets musicaux. Translated from French by S. Constantinou, London. 2011. Original text: ‘Cette unité serait, dans le parle, une unité de respiration ou d'articulation: en musique, l'unité de geste instrumental. L'objet sonore est a la rencoutre d'une action acoustique et d'une intention d'ecoute.’ PhD Thesishttps://ethos.bl.uk/OrderDetails.do;jsessionid=8F8EA8B59C29D0167471F8168337E5F3?uin=uk.bl.ethos.679793?
- Roads, Curtis (2001). Microsound (2nd ed.). Cambridge, Mass: MIT Press. p. 409. ISBN 978-0-262-18215-7.
- Schaeffer, Pierre (2012). In Search of a Concrete Music. Translated by North, Christine; Dack, John. London: University of California. ISBN 978-0-520-26573-8. OCLC 788263789.
- Schaeffer, Pierre (2002). Traité des objets musicaux. Paris: Nouvelle édition (Editions du Seuil). p. 271.