<p>A systematic approach to retrieve individual parts in a monaural music recording with its score is introduced. We are interested in isolating the accompaniment part by removing the solo part from a recording of concerto music in which a solo instrument is accompanied by an orchestra. We require the music audio, the score, and optionally a sample library of individual notes played in isolation. Our approach is based on explicit knowledge of the musical audio at the semantic level (notes or chords) from an audio-score alignment. Such knowledge allows the spectrogram energy to be decomposed into note-based models that could be trained with the sample library. Our approach can be divided into: (1) "masking" to estimate a solo mask to remove the solo and (2) "reconstruction" to impute the missing harmonics of the orchestra notes that have been inevitably damaged in masking. </p><p> In "masking," we estimate a 2-dimensional binary mask to classify each time-frequency cell of the short-time Fourier Transform (STFT) spectrogram as either solo or accompaniment in STFT domain. We mainly employ an Expectation Maximization (EM) algorithm to decompose spectrogram magnitude into note-based models. In this process of "erasing" the soloist&rsquo;s contribution to the mixture by applying the mask, the remaining orchestra is degraded. In "reconstruction," we propose a novel technique to repair such degradation. We use a state-space model for each note partial which is represented by a slowing-changing amplitude envelope and an "unwrapped" phase sequence. Such amplitude-phase representation can be computed by Kalman smoothing. It allows us to "transpose" intact partials of the orchestra part onto the degraded time-frequency region. Objective metrics and subjective listening are used on real and synthesized musical audio data for evaluation and parameter optimization. </p>

The teaching methodology of the flipped classroom is quickly growing in popularity within the education community and making its way into library instruction as well. This paper will introduce the concept of flipped teaching, identify its potential for integration into library instruction, and highlight two case studies of how this pedagogical approach was applied at the University of Saskatchewan Library. This interactive session will keep you on your toes. Expect homework in advance! / Slides presented at the Workshop for Instruction in Library Use conference in London, ON, in May 2014

The flipped teaching methodology is well documented within the education research literature, growing in popularity within university classrooms and making its way into library instruction. In light of current technological trends affecting higher education, libraries are challenged to explore new approaches to library instruction including strategies for inclusion of online classrooms, distributed learners, and interactive technologies. This presentation will include a summary of the research evidence on flipped teaching and its value for inclusion in library instruction. It will also look at the application of this evidence as applied to two case studies at the University of Saskatchewan Library and preliminary findings on outcomes from these cases. This presentation is relevant to why librarians are conducting research by highlighting the benefits of using research evidence to inform the practice of library instruction, to create better instructional tools and to meet the learning needs of today’s students. This presentation also links to research being done by librarians, as it documents an in-progress research project on the efficacy of the flipped classroom for library instruction. / Slides presented at the C-EBLIP Fall Symposium in Saskatoon, SK, in October 2014

Essa pesquisa faz um recorte da música eletrônica através de suas linguagens, práticas documentárias e processos informativos, estudados a partir de contextos socioculturais, para observar sua constituição como um gênero musical popular. A informatividade da música eletrônica foi compreendida em seus complexos de relações terminológicas e conjecturas diversas, ilustrando e identificando interrelações, propriedades estéticoformais, categorizações e características discursivas e linguísticas. Conceitos da Ciência da Informação e das humanidades foram utilizados para analisar como esse gênero irresoluto e fragmentado por muitas definições, processos anticategóricos e conflitos de distinção cultural, acaba por definir-se como um campo de intensa materialidade informativa e histórica, que segue tendo na ideia de \"música eletrônica\" seu universo simultaneamente amplo e circunscrito. Objetos, fenômenos, o devir musical, categorias e as linguagens dessa música foram estudados sob os vértices da informatividade, como proposta por Bernd Frohmann, conceito processual que surge a partir da ideia dos documentos como definidores e reveladores de contextos, problemáticas e discursos. Essa pesquisa conclui como a informatividade da música eletrônica logra documentá-la como tal: um gênero musical histórico, institucionalizado e documentado, coeso e problematizado por preponderantes aspectos informativos, referenciais e de categorização - um fenômeno da Cultura e da Informação. / This research outlines electronic music through its languages, documentary practices, informative processes and their sociocultural contexts, to observe its constituion as a popular music genre. The informativenesse of electronic music is seen from its complexes of terminology relations and several conjectures, that illustrate and identify interrelations, aesthetic and formal properties, categorizations, discursive and linguistic characteristics. Concepts from Information Science and other humanities have been used to analyze how this irresolute musical genre, fragmented by anti-categorical and cultural distinction conflits, ends up being defined as a field of intense informative and historical materiality. This music still relies this wide and also circumscribed universe on the idea of \"electronic music\". Objectos, phenomena, the music becoming, categories and languages of this music have been studied under the informativeness theorical vertices, as proposed by Bernd Frohmann, a procedural concept that arises from the ideia of documents as defining elements of contexts, discourses and problems. This research concludes how informativeness manages to document electronic music as such: a historical, institutionalized and documented musical genre, cohesive and also very problematized by its preponderant informative, referential and categorical aspects - a Cultural and Informative phenomenon.

The metrical structure is a fundamental aspect of music, yet its automatic analysis from audio recordings remains one of the great challenges of Music Information Retrieval (MIR) research. This thesis is concerned with addressing the automatic analysis of changes of metrical structure over time, i.e. metric modulations. The evaluation of automatic musical analysis methods is a critical element of the MIR research and is typically performed by comparing the machine-generated estimates with human expert annotations, which are used as a proxy for ground truth. We present here two new datasets of annotations for the evaluation of metrical structure and metric modulation estimation systems. Multiple annotations allowed for the assessment of inter-annotator (dis)agreement, thereby allowing for an evaluation of the reference annotations used to evaluate the automatic systems. The rhythmogram has been identified in previous research as a feature capable of capturing characteristics of rhythmic content of a music recording. We present here a direct evaluation of its ability to characterise the metrical structure and as a result we propose a method to explicitly extract metrical structure descriptors from it. Despite generally good and increasing performance, such rhythm features extraction systems occasionally fail. When unpredictable, the failures are a barrier to usability and development of trust in MIR systems. In a bid to address this issue, we then propose a method to estimate the reliability of rhythm features extraction. Finally, we propose a two-fold method to automatically analyse metric modulations from audio recordings. On the one hand, we propose a method to detect metrical structure changes from the rhythmogram feature in an unsupervised fashion. On the other hand, we propose a metric modulations taxonomy rooted in music theory that relies on metrical structure descriptors that can be automatically estimated. Bringing these elements together lays the ground for the automatic production of a musicological interpretation of metric modulations.

Essa pesquisa faz um recorte da música eletrônica através de suas linguagens, práticas documentárias e processos informativos, estudados a partir de contextos socioculturais, para observar sua constituição como um gênero musical popular. A informatividade da música eletrônica foi compreendida em seus complexos de relações terminológicas e conjecturas diversas, ilustrando e identificando interrelações, propriedades estéticoformais, categorizações e características discursivas e linguísticas. Conceitos da Ciência da Informação e das humanidades foram utilizados para analisar como esse gênero irresoluto e fragmentado por muitas definições, processos anticategóricos e conflitos de distinção cultural, acaba por definir-se como um campo de intensa materialidade informativa e histórica, que segue tendo na ideia de \"música eletrônica\" seu universo simultaneamente amplo e circunscrito. Objetos, fenômenos, o devir musical, categorias e as linguagens dessa música foram estudados sob os vértices da informatividade, como proposta por Bernd Frohmann, conceito processual que surge a partir da ideia dos documentos como definidores e reveladores de contextos, problemáticas e discursos. Essa pesquisa conclui como a informatividade da música eletrônica logra documentá-la como tal: um gênero musical histórico, institucionalizado e documentado, coeso e problematizado por preponderantes aspectos informativos, referenciais e de categorização - um fenômeno da Cultura e da Informação. / This research outlines electronic music through its languages, documentary practices, informative processes and their sociocultural contexts, to observe its constituion as a popular music genre. The informativenesse of electronic music is seen from its complexes of terminology relations and several conjectures, that illustrate and identify interrelations, aesthetic and formal properties, categorizations, discursive and linguistic characteristics. Concepts from Information Science and other humanities have been used to analyze how this irresolute musical genre, fragmented by anti-categorical and cultural distinction conflits, ends up being defined as a field of intense informative and historical materiality. This music still relies this wide and also circumscribed universe on the idea of \"electronic music\". Objectos, phenomena, the music becoming, categories and languages of this music have been studied under the informativeness theorical vertices, as proposed by Bernd Frohmann, a procedural concept that arises from the ideia of documents as defining elements of contexts, discourses and problems. This research concludes how informativeness manages to document electronic music as such: a historical, institutionalized and documented musical genre, cohesive and also very problematized by its preponderant informative, referential and categorical aspects - a Cultural and Informative phenomenon.