A partir d'une interprétation musicologique de la notion scientifique de "modélisation et simulation'', cette thèse présente une approche d'analyse assistée par ordinateur où les partitions musicales sont reconstruites à partir de processus algorithmiques et simulées avec différents paramètres à partir desquels des variantes, appelés instances, sont générés. L'étude d'une pièce musicale par modélisation et simulation signifie comprendre l'oeuvre en la (re) composant de nouveau, en brouillant les limites entre le travail analytique et créatif. Cette approche est appliquée à trois études de cas: 1. une technique isolée, la "multiplication d'accords'', utilisé par Pierre Boulez (1925- 2016), qui a été explorée à travers le prisme formé par les théories de H. Hanson, S. Heinemann et L. Koblyakov; 2. La pièce "Spectral Canon pour Conlon Nancarrow" (1974) du compositeur américain James Tenney (1934-2006) à laquelle la simulation computationnelle à partir de différents paramètres a été prise à ses conséquences ultimes quand un "espace d'instances" est explorée a partir de stratégies de visualisation graphique; 3. Et enfin "Désordre" (1985), le première étude pour piano de l'austro-hongrois György Ligeti (1923-2006) dans laquelle les concepts de "tonalité combinatoire" et "décomposition en nombres premiers'', appliqué aux durées, ont été utilisés pour maximiser le potentiel de production d'instances. / From a musicological interpretation of the scientific notion of “modeling and simulation”, this thesis presents an approach for computer-aided analysis where musical scores are reconstructed from algorithmic processes and then simulated with different sets of parameters from which neighbouring variants, called instances, are generated. Studying a musical piece by modelling and simulation means to understand the work by (re)composing it again, blurring boundaries between analytical and creative work. This approach is applied to three case studies: an isolated technique, Pierre Boulez Chord Multiplication, which is explored through the prism formed by the theories of H. Hanson, S. Heinemann and L. Koblyakov; the piece Spectral Canon for Conlon Nancarrow (1974) by the american James Tenney (1934-2006) to which the computational simulation from different sets of parameters was taken to its ultimate consequences when a “space of instances” is created and strategies of visualisation and exploration are devised; and finally “Disorder”, the first piano study written by austro-hungarian György Ligeti in which the concepts of “combinatorial tonality” and “decomposition prime numbers”, applied to durations, are used to maximize the potential that a model has to produce different variations of the original piece.

This text outlines recent developments in my artistic practice. The two underlying themes of this work are my intonation practice, with and emphasis on just intonation, as well as the Japanese mouth-organ shō, which I am currently learning to play. The text discusses these topics, along with four of my recent works: Hypothermia for bass drum (2020) for gran cassa and electronics; Stycke för cembalo och elektronik (2021) for harpsichord and electronics; Breathing, bowing (2022) for viola da gamba and electronics; and Solo #1 (2022) for shō and unfiltered sawtooth waves. In these four pieces, I have explored different ways for the electronics to relate to and interact with the respective acoustic instruments with regards to intonation, spectromorphology and timbre. Both the pieces and the two underlying themes have not only been ventures into new aesthetic and technological areas, but they have also shaped my outlook on composition and the relationship between composer and musician. / <p>The presentation refers to my graduation concert, where two of the pieces discussed in this text were presented: <em>Breathing, bowing</em> and <em>Solo #1</em>. Along with these pieces, during the concert a newly composed ensemble piece was presented with me playing the shō alongside Johan Arrias (soprano saxophone), Gard Nergaard (hardingfela) and Vilhelm Bromander (contrabass).</p>