Dieter Schnebel's String Trio from 2007-2009 is a spatial sound composition that features unique visual components within a traditional string trio setting. This research provides performers and audiences a more thorough understanding of the String Trio and its evocative aesthetic qualities, by identifying and organizing the ways in which the visual and musical material interact. To provide context for String Trio, a brief overview of Schnebel's compositional style and influence on avant-garde musical trends of the latter half of the twentieth century is provided in chapter 2. Special consideration is given to his instrumental chamber music and works for string instruments. In chapter 3, the prior musical analysis and aesthetic context provides a basis for the many conceptual implications resulting from the incorporation of theatricality into a typically non-theatrical genre. The performers' roles within the ensemble and the ways in which they relate to one another as well as their audience, are illuminated and ultimately contribute to a deeper, enhanced experience of the piece. Expectations and traditional notions concerning formal, classical music etiquette are also explored through Schnebel's complex directional changes in orientation and unconventional utilization of the performance space.

The purpose of this thesis is to trace the history of the trumpet in chamber music through the first half of the 20th century. It aims to discuss the technical advances in the instrument and demonstrate the importance of the trumpet in this medium. Chamber music is defined, in this thesis, as all serious instrumental music for two or more instruments played with one instrument to a part. The selections have been chosen on the basis of recognized merit of the composer, the variety of instrumentation, and the availability of music.