This dissertation presents a categorization of existing methodologies of upper register development for euphoniumists with evaluation of effectiveness and current use of these methodologies. The purpose of this study is to provide euphonium musicians as well as educators with essential references and guides to applicable methods for developing the upper register more effectively with greater efficacy. The assessments of current methodologies include three steps: categorization, summarization, and evaluation. To support the significance why it could be more beneficial than the methodology alone, the dissertation will include the examination of the aspect of biomechanics and ergonomics, suggestions, and discussion of particular issues of the upper register.

Noted for both vocal and symphonic output, Gustav Mahler's musical sophistication constantly puzzled scholars in the past decades. In his symphonic works, the mixed forms and styles in combination with the vocal influence make it abstruse for listeners to detect the meaning of the use of traditional instruments. The solo violin, which has an extensive history of appearing in symphonic compositions since the Baroque era, is an instance of a traditional instrument given an unusual function. For instance, Mahler's violin solos do not tend to showcase the virtuosity of the instrument as they normally do in orchestral music. In order to closely examine the role of the solo violin, I rely on aspects relating to introversive semiosis such as harmonies, rhythms, textures, phrase structures, and forms; then my focus shifts to extroversive semiosis, specifically to topics and contextual factors. By considering the violin as a musical sign, listeners can comprehend the instrument's structure, syntax, and ultimately the complex logic of Mahler's musical discourse.