Three Solitudes and a DJ: A Mashed-up Study of Counterpoint in a Digital Realm

This dissertation is primarily concerned with developing an understanding of how the use of pre-recorded digital audio shapes and augments conventional notions of counterpoint. It outlines a theoretical framework for analyzing the contrapuntal elements in electronically and digitally composed musics, specifically music mashups, and Glenn Gould’s Solitude Trilogy ‘contrapuntal radio’ works. Conventional studies of counterpoint encompass sixteenth- through early twentieth-century modernist and neo- classical materials but stop there. Composition by magnetic tape and computer software using pre-existing recorded audio offers the potential for a new study of music that displays clear contrapuntal elements but lacks the analytical models to outline the underlying musical systems. Central to these investigations is the assertion that counterpoint operates not only within the sphere of art music but also in the compositional logic of non-musical sound works (radio documentary) and in the harmonic and melodic underpinnings of popular music. The first chapter examines technological and cultural developments that contribute to the formation of digital contrapuntal music. The second and third chapters outline the traditional musical elements—harmony, form, and texture—of contrapuntal radio and mashups, respectively. Chapter Four explores how counterpoint exists in the sonic space of the stereo or mono sound field. Chapter Five presents the notion of program as a useful concept for analyzing interaction between lyric samples to form original narratives. These two final chapters present the original contributions from contrapuntal radio and mashups to a study of counterpoint. In each of these chapters, counterpoint forms the basis for how we perceive the underlying systems of musical works composed by traditional counterpoint or by assembling pre-existing recorded audio. The connection between the old and new is important, as one does not supplant but augment the other. As such, counterpoint is a fluid musical concept, rather than a fixed system of rules governing composition in a narrow musical palette

Selection mechanisms affect volatility in evolving markets

Financial asset markets are sociotechnical systems whose constituent agents are subject to evolutionary pressure as unprofitable agents exit the marketplace and more profitable agents continue to trade assets. Using a population of evolving zero-intelligence agents and a frequent batch auction price-discovery mechanism as substrate, we analyze the role played by evolutionary selection mechanisms in determining macro-observable market statistics. In particular, we show that selection mechanisms incorporating a local fitness-proportionate component are associated with high correlation between a micro, risk-aversion parameter and a commonly-used macro-volatility statistic, while a purely quantile-based selection mechanism shows significantly less correlation.Comment: 9 pages, 7 figures, to appear in proceedings of GECCO 2019 as a full pape

On the stability and spectral radius of a finite set of matrices

This paper studies some problems related to the stability and the spectral radius of a finite set of matrices. A seasonal epidemic model is given to illustrate the use of the obtained results. In this example, the relationship between the obtained results and the stability of a discrete time periodic linear system is obtained.This work has been partially supported by Spanish [grant number MTM2013-43678-P].Cantó Colomina, B.; Coll, C.; Sánchez, E. (2016). On the stability and spectral radius of a finite set of matrices. Linear and Multilinear Algebra. 64(3):353-361. https://doi.org/10.1080/03081087.2015.1040404S35336164

Near-Infrared Spectroscopy of McNeil's Nebula Object

We present 0.8-5.2 micron spectroscopy of the compact source at the base of a variable nebula (McNeil's Nebula Object) in the Lynds 1630 dark cloud that went into outburst in late 2003. The spectrum of this object reveals an extremely red continuum, CO bands at 2.3-2.5 microns in emission, a deep 3.0 micron ice absorption feature, and a solid state CO absorption feature at 4.7 microns. In addition, emission lines of H, Ca II, Mg I, and Na I are present. The Paschen lines exhibit P Cygni profiles, as do two lines of He I, although the emission features are very weak in the latter. The Brackett lines, however, are seen to be purely in emission. The P Cygni profiles clearly indicate that mass outflow is occurring in a wind with a velocity of ~400 km/s. The H line ratios do not yield consistent estimates of the reddening, nor do they agree with the extinction estimated from the ice feature (A_V ~ 11). We propose that these lines are optically thick and are produced in a dense, ionized wind. The near-infrared spectrum does not appear similar to any known FUor or EXor object. However, all evidence suggests that McNeil's Nebula Object is a heavily-embedded low-mass Class I protostar, surrounded by a disk, whose brightening is due to a recent accretion event.Comment: 11 pages, 2 ps figures, accepted for publication in ApJ Letter

The density matrix in the de Broglie-Bohm approach

If the density matrix is treated as an objective description of individual systems, it may become possible to attribute the same objective significance to statistical mechanical properties, such as entropy or temperature, as to properties such as mass or energy. It is shown that the de Broglie-Bohm interpretation of quantum theory can be consistently applied to density matrices as a description of individual systems. The resultant trajectories are examined for the case of the delayed choice interferometer, for which Bell appears to suggest that such an interpretation is not possible. Bell's argument is shown to be based upon a different understanding of the density matrix to that proposed here.Comment: 15 pages, 4 figure