Modeling the multiscale structure of chord sequences using polytopic graphs

International audienceChord sequences are an essential source of information in a number of MIR tasks. However, beyond the sequential nature of musical content, relations and dependencies within a music segment can be more efficiently modeled as a graph. Polytopic Graphs have been recently introduced to model music structure so as to account for multiscale relationships between events located at metrically homologous instants. In this paper, we focus on the description of chord sequences and we study a specific set of graph configurations , called Primer Preserving Permutations (PPP). For sequences of 16 chords, PPPs account for 6 different latent systems of relations, corresponding to 6 main structural patterns (Prototypical Carrier Sequences or PCS). Observed chord sequences can be viewed as distorted versions of these PCS and the corresponding optimal PPP is estimated by minimizing a description cost over the latent relations. After presenting the main concepts of this approach, the article provides a detailed study of PPPs across a corpus of 727 chord sequences annotated from the RWC POP database (100 pop songs). Our results illustrate both qualitatively and quantitatively the potential of the proposed model for capturing long-term multiscale structure in musical data, which remains a challenge in computational music modeling and in Music Information Retrieval

16th Sound and Music Computing Conference SMC 2019 (28–31 May 2019, Malaga, Spain)

The 16th Sound and Music Computing Conference (SMC 2019) took place in Malaga, Spain, 28-31 May 2019 and it was organized by the Application of Information and Communication Technologies Research group (ATIC) of the University of Malaga (UMA). The SMC 2019 associated Summer School took place 25-28 May 2019. The First International Day of Women in Inclusive Engineering, Sound and Music Computing Research (WiSMC 2019) took place on 28 May 2019. The SMC 2019 TOPICS OF INTEREST included a wide selection of topics related to acoustics, psychoacoustics, music, technology for music, audio analysis, musicology, sonification, music games, machine learning, serious games, immersive audio, sound synthesis, etc

Polytopic Graph of Latent Relations: A Multiscale Structure Model for Music Segments

International audienceMusical relations and dependencies between events within a musical passage may be better explained as a graph rather than in a sequential framework. This article develops a multiscale structure model for music segments, called Polytopic Graph of Latent Relations (PGLR) as a way to describe nested systems of latent dependencies within the musical flow. The approach is presented conceptually and algorithmically, together with an extensive evaluation on a large set of chord sequences from a corpus of pop songs. Our results illustrate the efficiency of the proposed model in capturing structural information within such data

Kenya in Motion 2000-2020

This edited volume offers a broad understanding and particular visions of Kenya in the first quarter of the twenty-first century. By bringing together rigorous yet accessible contributions, it shows how, since the 2002 transition, Kenya has been striving for change through economic modernisation and political liberalisation. The planned transformations are coming to fruition, even if the legacies of the past and political habits are slowing down the process. The various chapters take us from developmental capitalism to extreme poverty and enduring inequalities, from reforms on paper to mixed results in multiple sectors: decentralised governance, natural resources, land, and education. They also explore Kenya’s ancient and colonial history and the diversity of its population. Thus, the book helps understand contemporary political, religious and community cleavages, the asymmetries between towns and the countryside, between Nairobi and the coast, in a country open to the world, as much through trade and finance as through art networks.Cet ouvrage offre une saisie synthétique et des visions particulières du Kenya en ce premier quart du XXIe siècle. Il rassemble des contributions rigoureuses et accessibles pour montrer comment, depuis l’alternance de 2002, le Kenya s’efforce de changer par la modernisation économique et la libéralisation politique. Les transformations annoncées voient le jour, même si les legs du passé et les habitus politiques en ralentissent la marche. Les différents chapitres nous mènent du capitalisme développemental kényan à la grande pauvreté et aux inégalités vivaces, des réformes sur le papier aux mises en œuvre en demi-teinte dans de multiples secteurs : gouvernance décentralisée, ressources naturelles, foncier, éducation. L’histoire ancienne et coloniale, la diversité du peuplement au Kenya permettent de mieux comprendre les clivages politiques, religieux et communautaires, les asymétries entre villes et campagnes, entre Nairobi et la côte, dans un Kenya ouvert sur le monde, autant par le commerce et la finance que par les réseaux de l’art