I have chosen to be assessed as an instrumentalist and interpreter of music. The criteria laid down by the University of Salford Senate Research and Graduate Studies Committee has influenced the selection of repertoire performed on both my studio recording projects (one and four), my live major première performance (project two), and my live performance of historical interest (project three). My introductory chapter sets out to explore the progression of the euphonium from 1920 – 2020. I will briefly discuss the origins and development of euphonium solo repertoire with reference to performers, composers and the instrument’s social environment. It is hoped that this will provide a meaningful context for my work in the development and dis...