Instants et espaces investis par la musique, les sessions sont actuellement en Irlande un marqueur d'expression culturelle.En surface, celles-ci peuvent être définies en tant que regroupement prévu ou spontané de plusieurs musiciens dans le but de faire de la musique et de passer un agréable moment ensemble. Toutefois, un travail d'enquête réparti sur sept années de recherches dans le nord-ouest irlandais a révélé qu'en profondeur, les sessions représentent un phénomène socioculturel complexe, phénomène social autant que musical, fait musical autant que social, édifice symbolique mixte tissé d'interactions dont la combinatoire à chaque fois renouvelée implique un jeu de relations entre facteur individuel et les stratégies collectives qui, radicalement, affectent l'ensemble de la structure de l'évènement.Comprendre le fonctionnement d'une session revient alors à poser un certain nombre de questions ayant pour finalité de révéler la manière dont les deux pôles du social et du musical se trouvent, en même temps que distincts, inextricablement liés, à partir d'une procédure de mise en série, il est proposé d'apprécier les liens entre structure et contexte à travers l'analyse comparée d'un corpus de 26 pièces musicales, collectées dans le cadre de 7 situations de sessions distinctes. Il s'agit d'observer si 1)les spécificités sonores immanentes d'une performance musicale en session dépendent des rapports entretenus par les musiciens et leur environnement ; et si 2) des indices musicologique tangibles de cela existent, en même temps que suffisent à rendre compte des différents processus interactionnels auxquels on les suppose liés - l'idée en question étant bien ici celle d'une possible incarnation des faits interactionnels lesquels, figés en quelque sorte dans la musique, s'inscrivent dans le produit symbolique à l'instar pourrait-on dire du fossile prisonnier de la roche. Le sonore, comme objet formerait alors le témoin matériel d'une réalité symbolique mixte, la musique, aux contours restant toutefois à définir sur bien d'autres plans. / As period of time and spatial entities invested by music, sessions in Irleandnowadays are a marker of cultural expression, superficially, those can be defined as a gatering, planned or spontaneous, of several musicians with the prospect to produce music and to share a nice moment together. Yet, a survey pursued over a seven-year research work in north-western Ireland revealed that, in depth sessions represent complex socio-cultural events, social as much as musical, musical as well as social happening, symbolic entity enriched by interactions whose permanently renewed combination reflects the interplay between individual factors and group strategies, that, radically, affect the whole structure of the event.To understand how a session functions then requiredraising a number of questions whose end is to elucidate how the two poles, social and musical, happen to be inextricably linked, though distinct at the same time musical sessionsthus become a source of problems wich, a priori connected to the amount of knowledge specific of our topic, lead to overcome the exclusive domain od ireland up o facing the broader isuues of contemporary ethnomusicology. The present theses includes five chapters. The first ome is a general description of sessions. Attention is paid to the dynamic links operating between what belongs to music and what proceeds from a line more specifically social. Questions then raised trigger a second chapter, whose content is bipartite. First are exposed the major problems on which the thesis rests, and secondly the methodological answers related to the given problematic. A third chapter consists of setting the spectrum of methods required to conduct analyses, through a reflexion bearing on the system properties of the whole range of social and musical parameters comparative analysis of 26 musical pieces that were collected in the context of seven different situations in distinct sessions. In the fifth chapter, the thesis ends with a synthesis of all analytical results as a gathered in the previous chapters.

Desde seus primeiros concertos em 1953 até finais dos anos 1990, a Orquestra Sinfônica do Estado de São Paulo (Osesp) teve uma atuação marcada por grande volatilidade, patinando em contextos de precariedade. A inauguração em 1999 da Sala São Paulo, sede da Osesp, foi o principal marco da chamada reestruturação da orquestra e contribuiu de maneira definitiva para a conquista de estabilidade e excelência artística em padrões ainda não vistos no país. Nos anos seguintes, a atuação da Osesp veio a ter grande impacto no adensamento da atividade sinfônica no Brasil. Esta tese procura identificar os principais conflitos e impasses que se colocaram durante esse processo, analisando o comportamento dos agentes nele envolvidos. Proponho que a principal força discursiva no lançamento da Sala São Paulo tem origem na dissonância entre um projeto de nível internacional no campo da música clássica e a carga simbólica de degradação do bairro da Luz. A instalação da Osesp na Sala São Paulo foi anunciada como um instrumento de transformação urbana, mas a difícil consolidação de seu projeto de estabilidade e excelência implicou o relativo insulamento da orquestra e o enfraquecimento de uma vocação mais democrática. / Since its first concerts in 1953 until the late 1990s, the activities of the São Paulo State Symphony Orchestra (Osesp) have been characterized by a great deal of volatility, precariously skating on thin ice. The inauguration in 1999 of the Sala São Paulo concert hall, the Osesps headquarters, was the landmark moment in the so-called restructuring of the orchestra, and definitively contributed to the cementing of its permanence and artistic excellence at a level hitherto unseen in Brazil. In the years that followed, the Osesp has had a great impact on the consolidation of the symphonic tradition in Brazil. This thesis seeks to identify the principal conflicts and impasses that have arisen during this process, analysing the behaviour of the parties involved. I propose that the main discursive force during the launch of the Sala São Paulo concert hall stemmed from the dissonance between a project of international standing in the field of classical music and the symbolic burden of the degradation of the Luz district of the city of São Paulo. The announcement that the Osesp would be based in the Sala São Paulo was an urban regeneration strategy but the difficulties of consolidating the orchestras permanence and excellence involved the relative isolation of the orchestra and the undermining of a more democratic project.

Desde seus primeiros concertos em 1953 até finais dos anos 1990, a Orquestra Sinfônica do Estado de São Paulo (Osesp) teve uma atuação marcada por grande volatilidade, patinando em contextos de precariedade. A inauguração em 1999 da Sala São Paulo, sede da Osesp, foi o principal marco da chamada reestruturação da orquestra e contribuiu de maneira definitiva para a conquista de estabilidade e excelência artística em padrões ainda não vistos no país. Nos anos seguintes, a atuação da Osesp veio a ter grande impacto no adensamento da atividade sinfônica no Brasil. Esta tese procura identificar os principais conflitos e impasses que se colocaram durante esse processo, analisando o comportamento dos agentes nele envolvidos. Proponho que a principal força discursiva no lançamento da Sala São Paulo tem origem na dissonância entre um projeto de nível internacional no campo da música clássica e a carga simbólica de degradação do bairro da Luz. A instalação da Osesp na Sala São Paulo foi anunciada como um instrumento de transformação urbana, mas a difícil consolidação de seu projeto de estabilidade e excelência implicou o relativo insulamento da orquestra e o enfraquecimento de uma vocação mais democrática. / Since its first concerts in 1953 until the late 1990s, the activities of the São Paulo State Symphony Orchestra (Osesp) have been characterized by a great deal of volatility, precariously skating on thin ice. The inauguration in 1999 of the Sala São Paulo concert hall, the Osesps headquarters, was the landmark moment in the so-called restructuring of the orchestra, and definitively contributed to the cementing of its permanence and artistic excellence at a level hitherto unseen in Brazil. In the years that followed, the Osesp has had a great impact on the consolidation of the symphonic tradition in Brazil. This thesis seeks to identify the principal conflicts and impasses that have arisen during this process, analysing the behaviour of the parties involved. I propose that the main discursive force during the launch of the Sala São Paulo concert hall stemmed from the dissonance between a project of international standing in the field of classical music and the symbolic burden of the degradation of the Luz district of the city of São Paulo. The announcement that the Osesp would be based in the Sala São Paulo was an urban regeneration strategy but the difficulties of consolidating the orchestras permanence and excellence involved the relative isolation of the orchestra and the undermining of a more democratic project.