Carlos Guedes

New York University Abu Dhabi

We present a hierarchical harmonic mixing method for assisting users in the process of music mashup creation. Our main contributions are metrics for computing the harmonic compatibility between musical audio tracks at small- and large-scale structural levels, which combine and reassess existing perceptual relatedness (i.e., chroma vector similarity...

This paper presents a summary of my keynote address discussing the differences between real-time composition (RTC) and improvisation. A definition of real-time composition is presented, as well as a summary discussion of its theoretical framework. Finally, a comparison between RTC and improvisation is done taking into account Richard Ashley’s discu...

We present a novel model for the characterization of musical rhythms that is based on the pervasive rhythmic phenomenon of syncopation. Syncopation is felt when the sensation of the regular beat or pulse in the music is momentarily disrupted; the feeling arises from breaking more expected patterns such as pickups (anacrusis) and faster events that...

In this paper I present a definition of Real-Time Composition (RTC) as well as framework for classifying systems that enable this type of compositional approach. I also present four examples of RTC systems in which I was involved with their development, and discuss why is it important to look at RTC as a framework that can provide new interesting a...

We present a method for assisting users in the process of music mashup creation. Our main contribution is a harmonic compatibility metric between musical audio samples which combines existing perceptual relatedness (i.e., chroma vectors or key anity) and conso-nance approaches. Our harmonic compatibility metric is derived from Tonal Interval Space...

In this paper we present the INESC Key Detection (IKD) system which incorporates a novel method for dynamically biasing key mode estimation using the spatial displacement of beat-synchronous Tonal Interval Vectors (TIVs). We evaluate the performance of the IKD system at finding the global key on three annotated audio datasets and using three key-de...

We present D’accord, a generative music system for creating harmonically compatible accompaniments of symbolic and musical audio inputs with any number of voices, instrumentation and complexity. The main novelty of our approach centers on offering multiple ranked solutions between a database of pitch configurations and a given musical input based o...

In this paper we explore a method for automatically generating Carnatic style rhythmic. The method uses a set of annotated Carnatic percussion performances to generate new rhythmic patterns. The excerpts are short percussion solo performances in ādi tāla (8 beat-cycle), performed in three different tempi (slow/moderate/fast). All excerpts were manu...

INTRODUCTION Recently, the focus of computational music analysis is extending from Eurogenetic music to include music of other cultures. Serra (2011, 2014) and Bozkurt et al. (2014) present a review of the current methodologies in computational analysis of Indian and Turkish music and discuss the potential of including cultural-specific knowledge t...

INTRODUCTION Recently, the focus of computational music analysis is extending from Eurogenetic music to include music of other cultures. Serra (2011, 2014) and Bozkurt et al. (2014) present a review of the current methodologies in computational analysis of Indian and Turkish music and discuss the potential of including cultural-specific knowledge t...

The most important feature of rhythm is its organization in hierarchical metrical cycles of various levels. Estimating the different rhythmic periodicities such as tempo and music cycle from audio is important to gain insight into the rhythmic information of the music signal in different time scales. Several approaches have been proposed in the pas...

In this paper we present a 12-dimensional tonal space in the context of the Tonnetz, Chew’s Spiral Array, and Harte’s 6-dimensional Tonal Centroid Space. The proposed Tonal Interval Space is calculated as the weighted Discrete Fourier Transform of normalized 12-element chroma vectors, which we represent as six circles covering the set of all possib...

We present Conchord, a system for real-time automatic generation of musical harmony through navigation in a novel 12-dimensional Tonal Interval Space. In this tonal space, angular and Euclidean distances among vectors representing multi-level pitch configurations equate with music theory principles, and vector norms acts as an indicator of consonan...

This paper presents a computational toolkit for the real-time and offline analysis of audio signals in Pure Data. Specifically, the toolkit encompasses tools to identify sound objects from an audio stream and to describe sound objects attributes adapted to music analysis and composition. The novelty of our approach in comparison to existing audio d...

In this paper, we present an application using an evolutionary algorithm for the real-time generation of polyphonic drum loops in a particular style. The population of rhythms is derived from the analysis of MIDI drum loops, which profile each style for subsequent automatic generation of rhythmic patterns that evolve over time through genetic algor...

Syncopation is a rhythmic phenomenon present in various musical styles and cultures. We present here a set of simple rhythmic transformations that can serve as a formalized model for syncopation. The transformations are based on fundamental features of the musical meter and syncopation, as seen from a cognitive and a musical perspective. Based on t...

This paper examines the correlation between musical dissonance and auditory roughness—the most significant factor of psychoacoustic dissonance—and the contribution of the latter to algorithmic composition. We designed an empirical study to assess how auditory roughness cor- relates with human judgments of dissonance in natural musical stimuli on th...

This paper presents a dynamic interface and voicing algo- rithm for real-time performance of jazz piano comping. Starting with a given song with a predefined harmonic progression, the algorithm calculates and maps an array of chord voicings to a virtual piano keyboard that can be played in real-time with any physical multi-touch input device like a...

This paper describes a contour-based algorithm for the real-time automatic generation of jazz walking bass lines, fol-lowing a given harmonic progression. A brief description of the walking bass procedure will be presented, and also a brief survey on some common implementations and tech-niques. This algorithm was implemented in the Max/MSP graphi-c...

What are the properties of sound signals that induce the experience of groove in listeners? Groove is often described as the experience of music that makes people tap their feet and want to dance. The ShakeIt project looks into systematic patterns of signal properties (timing, metrical, dynamic, etc.) and relates them to the experience of groove. T...

This paper describes the creative and technical processes behind earGram, an application created with Pure Data for real-time concatenative sound synthesis. The system encompasses four generative music strategies that automatically rearrange and explore a database of descriptor-analyzed sound snippets (corpus) by rules other than their original tem...

Information and Communication Technologies (ICTs) are considered a powerful tool for economic development and the growth of societies. However, instead of helping overcome society's inequalities caused by the digital era, they have instigated an increase of the people that rested aside of the information age. The digital divide refers to the diffic...

This paper presents an overview of the GimmeDaBlues app for iOS devices, by Sonicability Inc., which allows the user to play a jazz/blues quartet, playing trumpet and/or keyboard, while being automatically accompanied by a virtual bassist and drummer. The application can also be used as an educational tool as an automatic play-along generator, allo...

This paper examines the aesthetic dimension and the technical realization of Dialogismos I, a piece for saxophone alto and electronics by the composer Nuno Peixoto de Pinho. The conceptual basis of the work relies on the notion of ‘intertextuality’ coined by the Bulgarian-French philosopher and literary critic Julia Kristeva, which was somehow tran...

In this paper we address the problem of measuring syncopation in order to mediate a musically meaningful interac-tion between a live music performance and an automati-cally generated rhythm. To this end we present a simple, yet effective interactive music system we developed. We shed some light on the complex nature of syncopation by looking into M...

For centuries, music has been shared and remembered by two traditions: aural transmission and in the form of written documents normally called musical scores. Many of these scores exist in the form of unpublished manuscripts and hence they are in danger of being lost through the normal ravages of time. To preserve the music some form of typesetting...

This paper describes an application for iPhone/iPod Touch/iPad devices that allows anyone to play jazz keyboard and solo instruments along a predefined harmonic progression, using the multi-touch properties of the iOS devices. While the user plays keyboard and/or solo instruments, the application automatically generates the bass and drums parts, re...

The use of Information and Communication Technologies (ICTs) has grown substantially over the past few years. However, a portion of the world's society has not been able to keep up with these technological advances. For this purpose, we present a serious game with a multi-touch interface envisioned to encourage and teach digitally excluded people o...

In this study, we focus on the interaction between microtiming patterns and several musical properties: intensity, meter and spectral characteristics. The data-set of 106 musical audio excerpts is processed by means of an auditory model and then divided into several spectral regions and metric levels. The resulting segments are described in terms o...

Optical Music Recognition (OMR) systems are an important tool for the automatic recognition of digitized music scores. However, handwritten musical scores are especially problematic for an automatic recognition. They have irregularities that go from heterogeneous illumination to variability in symbols shape and complexity inherent to music structur...

In music information retrieval, one of the central goals is to automatically recommend music to users based on a query song or query artist. This can be done using expert knowledge (e.g., www.pandora.com), social meta-data (e.g., www.last.fm), collaborative filtering (e.g., www.amazon.com/mp3), or by extracting information directly from the audio (...

In this paper we present an algorithm for real–time full-body skeletonization and visualization implemented as two external objects for Max/MSP/Jitter. These objects are intended to provide an accurate description of bodily motion as captured by a video camera, to be used as musical rhythm controller in interactive music systems.

The preservation of musical works produced in the past requires their digitalization and transformation into a machine-readable format. The processing of handwritten musical scores by computers remains far from ideal. One of the fundamental stages to carry out this task is the staff line detection. We investigate a general-purpose, knowledge-free m...

The connection of "groove" with low-level features in the audio signal has been mostly associated with temporal characteristics of fast metrical structures. However, the production and perception of rhythm in Afro-Brazilian contexts is often described as a result of multiple experience flows, which expands the description of rhythmical events to mu...

The echo locations project is a series of site-specific installations utilizing motion sensing to invite observers to slow down, give the site their attention, and be still long enough for ghostly images to form of how people have moved through the site in the past.

Many music works produced in the past are currently available only as original manuscripts or as photocopies. Preserving them entails their digitalization and consequent accessibility in a machine-readable format, which encourages browsing, retrieval, search and analysis while providing a generalized access to the digital material. Carrying this ta...

The preservation of many music works produced in the past entails their digitalization and consequent accessibility in an easy-to-manage digital format. Carrying this task manually is very time consuming and error prone. While optical music recognition systems usually perform well on printed scores, the processing of handwritten musical scores by c...

This paper presents the program in electronic music composition and musical production at the School of the Arts of the Polytechnic Institute of Castelo Branco (http://www.esart.ipcb.pt). This study program offers a 1st cycle degree and is functioning since the academic year of 2005/2006. At the conference, we will present the curriculum of the pro...

Many music works produced in the past still exist only as original manuscripts or as photocopies. Preserving them entails their digitalization and consequent accessibility in a digital format easy-to-manage. The manual process to carry out this task is very time consuming and error prone. Optical music recognition (OMR) is a form of structured docu...

This paper describes methods used to construct an interactive installation using human motion to animate both a visual and aural particle system. It outlines the rotoscoping, meta-motion processing, aural and visual rendering systems. It goes into detailed explanation of the "particle flow" systems which lend form to the virtual characters. The pap...

In this paper, I describe the theoretical background that led to the creation of software for interactive dance performance that interprets rhythm in dance movement as musical rhythm. This software was implemented as a library of external objects for Max/MSP[12] that processes data from an object or library that performs frame-differencing analysis...

In this demonstration, I exemplify how a musical channel of communication can be established in computer-mediated interaction between musicians and dancers in real time. This channel of communication uses a software library implemented as a library of external objects for Max/MSP[1], that processes data from an object or library that performs frame...

This paper describes the methods used to construct an interactive installation using human motion to animate both an aural and visual particle system in synch. It outlines the rotoscoping, meta-motion processing, and visual particle system software. The paper then goes into a detailed explanation of the audio software developed for the project.

In this paper, I discuss in detail the approach taken in the implementation of two external objects in Max/MSP [10] that can extract musically relevant rhythmic information from dance movement as captured by a video camera. These objects perform certain types of analysis on the digitized video stream and can enable dancers to generate musical rhyth...

This software library allows a dancer to control the tempo of an electronically-generated music score, and/or to generate musical rhythmic structures from bodily movement in real time in interactive dance performance. The movement data is gathered non-invasively, using a fixed video camera placed outside the area in which the dancer is moving. This...

In this paper, I present a possible approach for the control of musical tempo in real-time from dance movement. This is done through the processing of video analysis data from a USB web cam that is used to capture the movement sequences. The system presented here, consists of a library of Max externals that is currently under development. This set...

Many music works produced in the past still exist only as original manuscripts or as photocopies. Preserving them entails their digitalization and consequent accessibility in a digital format easy-to-manage. The manual process to carry out this task is very time consuming and error prone. Optical music recognition (OMR) is a form of structured docu...

We introduce a novel algorithm for automatically generating rhythms in real time in a certain meter. The generated rhythms are "generic" in the sense that they are characteristic of each time signature without belonging to a specific musical style. The algorithm is based on a stochastic model in which various aspects and qualities of the generated...