Creating a fitness function for music is largely subjective and dependent on a programmer's personal tastes or goals. Previous attempts to create musical fitness functions for use in genetic algorithms lack scope or are prejudiced to a certain genre of music. They also suffer the limitation of producing music only in the strict style determined by the programmer. We show in this paper that musical feature extractors that avoid the challenges of qualitative judgment enable creation of a multi-objective function for direct music production. Multi-objective fitness functions enable creation of music with varying identifiable styles. With this system we produced three distinct groups of music which computationally cluster into distinct styles as described by the set of feature extractors. We also show that knowledgeable individuals make similar clusters while a random sample of people make some similar and some different clusterings.

No description available.

No description available.

No description available.

No description available.

No description available.

No description available.

This study is an exploration of the integration in composition of theoretical and psychoacoustic properties of pitch and duration; its aims are essentially practical in showing how cognitive research can inform composition, but it also addresses more broadly the value and role cognition can have in the current musical compositional climate. Various contexts for this exploration are discussed: the mediating role analysis has within theory and composition; constraints imposed by aesthetic positions and music theory/pedagogy templates; the role of cognitive psychology in connecting music templates and listening experiences; and the ultimately mythopoetic (Cook, 1992) rather than scientific nature of any such theory/psychology integration. Using Huovinen’s “pitch constellation” approach and Lerdahl’s theory of tonal pitch space, a hierarchical pitch-space is set up for the string piece ed erra l’armonia, developing from pc set 5-22 a non-standard octatonic scale (pc set 8-27) as the basic pitch collection of the piece. Similarly, using the works of Fraisse, Hasty and London, a hierarchical rhythm-space is set up for the orchestral piece Pneuma developing, from the indifference interval in duration, the temporal and metric envelops and the duple and triple subdivisions of the tactus, a three layered metrical structure as the generative rhythmic template of the piece. This is contextualised against the problematic notion of metre in modern art-music. General characteristic of both spaces are discussed: redundancy according to information theory, hierarchy in relation to cognitive opaqueness, salience and association; and elaborational and permutational processes. It is argued that composition needs to bridge, in practice, the gap between music theory and psychology of music, looking beyond their often absolutist positions; that cognitive constrains in music should be seen as opportunities to work compositionally along the mind’s cognitive grains in order to maximise structural and expressive communication; and that at a time of a ‘deregulated’ musical language it is necessary to re-develop cognitive heuristics to secure the connection between compositional choices and listening experiences. Three principles are given as guidelines for the alignment of theoretical and cognitive issues in composition. It is proposed that cognitive analysis should be developed as an independent discipline as well as a compositional tool, and that the connections style/cognition should be looked at more closely to gain a more unified perspective on diverse (and divisive) stylistic musical camps.

The domain of this thesis is electroacoustic computer-based music and sound art. It investigates a facet of composition which is often neglected or ill-defined: the process of composing itself and its embedding in time. Previous research mostly focused on instrumental composition or, when electronic music was included, the computer was treated as a tool which would eventually be subtracted from the equation. The aim was either to explain a resultant piece of music by reconstructing the intention of the composer, or to explain human creativity by building a model of the mind. Our aim instead is to understand composition as an irreducible unfolding of material traces which takes place in its own temporality. This understanding is formalised as a software framework that traces creation time as a version graph of transactions. The instantiation and manipulation of any musical structure implemented within this framework is thereby automatically stored in a database. Not only can it be queried ex post by an external researcher—providing a new quality for the empirical analysis of the activity of composing—but it is an integral part of the composition environment. Therefore it can recursively become a source for the ongoing composition and introduce new ways of aesthetic expression. The framework aims to unify creation and performance time, fixed and generative composition, human and algorithmic “writing”, a writing that includes indeterminate elements which condense as concurrent vertices in the version graph. The second major contribution is a critical epistemological discourse on the question of ob- servability and the function of observation. Our goal is to explore a new direction of artistic research which is characterised by a mixed methodology of theoretical writing, technological development and artistic practice. The form of the thesis is an exercise in becoming process-like itself, wherein the epistemic thing is generated by translating the gaps between these three levels. This is my idea of the new aesthetics: That through the operation of a re-entry one may establish a sort of process “form”, yielding works which go beyond a categorical either “sound-in-itself” or “conceptualism”. Exemplary processes are revealed by deconstructing a series of existing pieces, as well as through the successful application of the new framework in the creation of new pieces.

An original composition in three movements for large orchestra. Following the score is a detailed analysis of the work, consisting of an introduction, three sections of analysis devoted to each of the three movements of the composition, and a short conclusion summarizing the analysis.