The purpose of this study is to analyze four late solo piano works of Franz Liszt that all bear the name “Mephisto ” in their titles, in order to examine, identify and trace the development in the use of harmonic and melodic idioms that produced non-tonal or “omnitonic ” effects, on the one hand, and to emphasize the need to duly accord Liszt a recognition of historical position as the nineteenth century’s most influential avant garde composer whose attitude and approach had helped to shape much of the ideal of the atonal composition of this century, on the other. Chapter One presents the issues and the purpose of this study; Chapter Two investigates the principal forces that shaped Liszt’s mature compositional style; Chapter Three identifi...