Approach towards defining color music

Below is the introductory paragraph I wrote when I began my research into color music.  This paragraph identifies my approach to creating the initial definition of color music.

One of the trends of twentieth-century composition has been the shift of focus in music from harmony and melody to timbre and pitch. This type of composition is often referred to as “color music.” In order to begin the process of defining “color music,” I will define a variety of subcategories from which this music is derived. Such subcategories include: Klangfarbenmelodie, micropolyphony, timbral manipulation, and spectral music. The subcategories explored in this paper are not all inclusive. Instead, I will identify and define what I consider to be the major subcategories in an attempt to create a definition of “color music.”