Polymetric writing is an integral technique in contemporary compositional practice. Dan Welcher and Yo Goto are principal employers of this practice in the wind band medium. Their methods endure even the results of modern scholarship showing limited human perception of polyrhythmic events. This dissertation provides a comprehensive metric analysis of excerpts from the music of Welcher and Goto. Five examples are explored from major band works of each of the two composers. The analytical process in the study utilizes the metrical concept set forth by Maury Yeston, so that a comparison can be made between the rhythmic components of the competing meters. The results of the study show that both Welcher and Goto, in all ten excerpts, create polymetric sections containing elements that surpass the aural limits proposed by modern scholarship. Additionally, through identification of the misaligned metric layers causing each polymeter, pedagogical considerations are offered to aid performance of each identified excerpt.

Contemporary repertoire is not commonly taught or explored by teachers during the intermediate level, when a student's musical training is transitioning to an advanced level. Nonetheless, it is important for piano instructors to be open-minded about contemporary music and have some perspective on the development of music repertoire in the future. The purpose of this dissertation is to provide a performance and pedagogical guide to Stephen Chatman's (b. 1950) Fantasies, from both technical and artistic viewpoints. The collection, which consists of eleven pieces, features a wide variety of contemporary idioms, styles, and means of notation. For instance, there are jazz-like syncopated rhythms, asymmetrical accents reminiscent of Primitivism, and Impressionistic or dissonant sonorities. Fantasies is not only a valuable tool for students to explore new sounds and improve their performing techniques while executing nontraditional notations and contemporary idioms, it is also a great teaching resource for instructors to promote students' musicality through hearing, seeing, and thinking. In this study, I provide individual, detailed descriptions for each of the pieces in the score, adding examples on how to address the difficulties they present to the performer. As a result, instructors can better understand how to help students prepare to perform this collection and spark their interest in playing contemporary music.

In the first half of the twentieth century, sporadic attempts of avant-garde composers to include sounds other than pitch in musical composition paved the way for the composers in the second half to embrace the sound of all types in their creative works. The development of technology since the mid-past century has facilitated composers' inclusive use of sound. The recent achievements in electronics and computers have led to cost-effective tools for today's composers to explore new possibilities in sound design and manipulation. Gradual for tenor saxophone and fixed electronics is primarily concerned with noise. Among the infinite possibilities of noise types, metallic sounds significantly contribute to the composition. The title of the piece refers to the compositional process in which the music progressively unfolds itself from the beginning to the end. The methods and strategies used to present the content give rise to a form I call accretion, described as an organic process by which the musical materials grow. Within the process, while established materials are interacting, combining, and forming layers, new materials may be incorporated and take part in the process. Throughout the composition, the interaction between sounds with common properties guides the music toward interactive unity, while the interplay between sounds with different characteristics forms a dialectical communication. The constant push-and-pull between the two states creates a restless tension throughout the composition. In the current version of Gradual, the audio signals from both saxophone and fixed electronics are transmitted to the same speakers, which helps coalesce acoustic and electronic sounds. The future prospect of the piece can involve real-time audio signal processing to manipulate the sound of saxophone. Adding the above feature to the current version will promote the unification of the two media into a single whole.

Audiovisual concatenative synthesis is an analysis-driven granular technique using a corpus of multimedia data to sequence audio and video streams on a microtemporal level. This text outlines my development of this technique as a tool for multimedia composition, using my work, Replica, as a case study. The paper illustrates how the concepts of granular structure, gesture capture, and replication are integral not only to the software but to the architecture of the composition. In doing so, machine learning approaches to music and visual art are reviewed and related to my personal compositional practice. Additionally, I attempt to show how audiovisual concatenative synthesis provides a composer with strategies for shaping one's sense of time through disorienting audiovisual cues and tightly organized counterpoint between sound and image, stage and screen, and the real and virtual.

"Natural Disasters" is a cycle of five extractable movements for septet, conductor and computer. Each movement in the cycle is inspired by the ways that humans are affected by and respond to five different classes or categories of natural disasters: meteorological, such as hurricanes, tornados, and haboobs; geological, like earthquakes and landslides; hydrological, including flooding and sea level rise; wildfires; and extra-planetary disasters such as meteors and solar flares. The disaster types are used as overarching themes and also as sources for the organization of the movements and their surface details. This paper presents an overview of the conception and organization of cycle, the themes addressed in each movement and the compositional techniques used. The history of composers using weather or disaster-related themes in prior music is reviewed, and a survey of contemporary disaster-related compositions is presented.

Entr'actes and Sappho Fragments (1964) by English Composer Harrison Birtwistle represent extended notation, complex meters, and extended instrumental techniques. After World War II, the style and techniques of musical composition evolved considerably and musical trends began to continuously change. Conducting contemporary compositions requires new approaches in conducting methods. This paper examines a) introduce important elements of Birtwistle's compositions in the 1960, b) include an updated score of Entr'actes and Sappho Fragments (notated by the author), and c) provide a performance guide to the work.

Mario Lavista (b. 1943) is a dominant figure in Mexican classical music. In the second half of the twentieth century, he promoted the use of contemporary techniques, leading to a series of collaborations with expert instrumentalists to explore extended techniques. Marsias for Oboe and Crystal Glasses is one of those pieces. Due to the nature of contemporary techniques, different oboes and reed styles produce different effects with the same fingerings. This document analyzes the contemporary fingerings in the two published editions of the work in consideration of the long-scrape reed style and oboes commonly used in the United States. The contemporary techniques were played on twelve professional oboe models as a way to collect data on how the printed fingerings work. The data is the foundation for the performance guide, which details every contemporary technique in the work. The performance guide also provides comprehensive information about the crystal glass logistics. The document also presents an electronic accompaniment created with Max/MSP in the event that the crystal glasses or crystal glass players are unavailable.

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