harmonic functioncan be defined as a contextual feature that can be attributed to a chord, a family of chords,harmonic progressions, or even to complete melodic phrases. These features are uniquefor each of the following functions: the tonic, the predominant, and the dominant. Theinteraction between these three creates a system of functional tonality, which undergirdsthe structure of tonal jazz and common-practice music

Chapter 3 defines harmonic function