This dissertation describes a compositional model rooted in cross-influential methodology between complementary musical compositions that share generative source material. In their simultaneous construction, two composition pairs presented challenges that influenced and mediated the other's development with respect to timbre, transposition, pitch material, effects processing, and form. A working prototype first provides a model that is later developed. The first work Thema is for piano alone, and the companion piece Am3ht is for piano and live computer processing via the graphical programming environment Max/MSP. Compositional processes used in the prototype solidify the cross-influential model, demanding flexibility and a dialectic approach. Ideas set forth in the prototype are then explored through a second pair of compositions rooted in cross-influential methodology. The first work Lusmore is scored for solo contrabass and Max/MSP. The second composition Knockgrafton is scored for string orchestra. The flexibility of the cross-influential model is revealed more fully through a discussion of each work's musical development. The utility of the cross-influential compositional model is discussed, particularly within higher academia.

Interactive installations in public settings have increased in popularity over the past decade, as well as the construction of digital musical instruments. In this paper I present a study of the interaction with a large sized augmented string instrument intended for a large installation in a museum, with focus on encouraging creativity, learning, and providing engaging user experiences. In the study, 9 participants were video recorded while playing with the string on their own, followed by an interview focusing on their experiences, creativity, and the functionality of the string. I then used McCarthy and Wright’s framework for analysing technology as experience and Frank E Williams creativity taxonomy model to analyse the results. In line with previous research, results highlight the importance of designing for different levels of engagement (exploration, experimentation, challenge). However, results additionally show that these levels need to consider the users’ age and musical background as these profoundly affect the way the user plays with and experiences the string. / Interaktiva installationer i offentliga miljöer har ökat i popularitet under det senaste decenniet, liksom även skapandet av digitala musikinstrument. I denna uppsats presenterar jag en studie av interaktionen med ett stort augmenterat stränginstrument avsedd för en stor installation i ett museum, med fokus på att uppmuntra kreativitet, lärande, och att ge engagerande användarupplevelser. I studien blev 9 deltagare videoinspelade samtidigt som de spelade med strängen på egen hand, följt av en intervju med fokus på deras upplevelse, kreativitet, och strängens funktionalitet Jag använde sedan McCarthy och Wrights ramverk för att analysera teknik som upplevelse och Frank E Williams kreativitets taxonomi för att analysera resultaten. I linje med tidigare forskning så betonar resultaten vikten av att designa för olika nivåer av engagemang (undersökande, experimenterande, utmaning). Dock så visar resultaten dessutom på att dessa nivåer måste ta hänsyn till användarnas ålder och musikaliska bakgrund då dessa starkt påverkar hur användaren spelar med och upplever strängen.

In Chapter 1, we give an introduction to the topic of open string field theory. The concepts presented include gauge invariance, tachyon condensation, as well as the star product.<p>In Chapter 2, we give a brief review of vacuum string field theory (VSFT), an approach to open string field theory around the stable vacuum of the tachyon. We discuss the sliver state explaining its role as projector in the space of half-string basis. We review the construction of D-brane solutions in vacuum string field theory. We show that in the sliver basis the star product correspond to a matrix product. <p>Using the material introduced in the previous chapters, in Chapter 3 we establish a translation dictionary between open and closed strings, starting from open string field theory. Under this correspondence, we show that (off--shell) level--matched closed string states are represented by star algebra projectors in open string field theory. As an outcome of our identification, we show that boundary states, which in closed string theory represent D-branes, correspond to the identity string field in the open string side. <p>We then turn to noncommutative field theories. In Chapter 4, we introduce the framework in which we will work. The tools introduced are solitons, projectors, and partial isometries.<p>The ideas of Chapter 4 are applied to specific examples in Chapter 5, where we present new solutions of noncommutative gauge theories in which coincident vortices expand into circular shells. As the theories are noncommutative, the naive definition of the locations of the vortices and shells is gauge-dependent, and so we define and calculate the profiles of these solutions using the gauge-invariant noncommutative Wilson lines introduced by Gross and Nekrasov. We find that charge 2 vortex solutions are characterized by two positions and a single nonnegative real number, which we demonstrate is the radius of the shell. We find that the radius is identically zero in all 2-dimensional solutions. If one considers solutions that depend on an additional commutative direction, then there are time-dependent solutions in which the radius oscillates, resembling a braneworld description of a cyclic universe. There are also smooth BIon-like space-dependent solutions in which the shell expands to infinity, describing a vortex ending on a domain wall.<p>In Chapter 6, we review the Fronsdal models for free high-spin fields that exhibit peculiar properties. We discuss the triplet structure of totally symmetric tensors of the free String Field Theory and their generalization to AdS background.<p>In Chapter 7, in the context of massless higher spin gauge fields in constant curvature spaces discussed in chapter 6, we compute the surface charges which generalize the electric charge for spin one, the color charges in Yang-Mills theories and the energy-momentum and the angular momentum for asymptotically flat gravitational fields. We show that there is a one-to-one map from surface charges onto divergence free Killing tensors. These Killing tensors are computed by relating them to a cohomology group of the first quantized BRST model underlying the Fronsdal action.<p><p> / Doctorat en Sciences / info:eu-repo/semantics/nonPublished

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This thesis focuses on the topic of piano accompaniment, which is an essential and beautiful part of piano playing. This field demands from the pianist a specific approach, which is a subject and core of many study programmes throughout the world. The aim of the first part of this thesis is to map the evolution as well as the current state of knowledge in the field of piano accompaniment using scientific literature on the subject as well as curricula of study programmes obtained from universities in central Europe, where piano accompaniment is taught as a major study course. A strong correlation has been established based on this research between theory in scientific literature on the subject and the current practice of piano accompaniment education in central Europe. The aim of the second part of this thesis is to expand further the level of knowledge in scientific literature, which is insufficient mainly in the accompaniment of solo musical instruments. For this reason, the second part of the thesis focuses on the specific problems in piano accompaniment of musical instrument groups, i.e. string instruments, woodwind instruments and brass instruments. For these three groups case studies have been created, which examine the specific characteristics of the musical instruments in relation to piano...

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<p>This dissertation consists of two parts. In the first part, we discuss the boundary and domain wall theories of the generalized quantum double lattice realization of the two-dimensional topological orders based on Hopf algebras. The boundary Hamiltonian and domain wall Hamiltonian are constructed by using Hopf algebra pairings and generalized quantum double. The algebraic data behind the gapped boundary and domain wall are comodule algebras and bicomodule algebras, respectively. The topological excitations in the boundary and domain wall are classified by bimodules over these algebras. Finally, via the Hopf tensor network representation of the quantum many-body states, we solve the ground state of the model in the presence of the boundary and domain wall.</p> <p><br></p> <p>In the second part, we introduce the weak Hopf algebra extension of symmetry, which arises naturally in anyonic quantum systems, and we establish weak Hopf symmetry breaking theory based on the fusion closed set of anyons. We present a thorough investigation of the quantum double model based on weak Hopf algebras, including the topological excitations and ribbon operators, and show that the vacuum sector of the model has weak Hopf symmetry. The gapped boundary and domain wall theories are also established. We show that the gapped boundary is algebraically determined by a comodule algebra, or equivalently, a module algebra, and the gapped domain wall is determined by the bicomodule algebra, or equivalently, a bimodule algebra. We also introduce the weak Hopf tensor network states, by which we solve the weak Hopf quantum double models on closed and open surfaces. Lastly, we discuss the duality of the quantum double phases.</p>

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The first chapter outlines the history of percussion instruments used by Béla Bartók, The second chapter deals with the use of percussion by various composers from Bach's time up to the period of Bartók. Chapter three outlines how Bartók uses percussion instruments.