This theory tries to combine modern with historical approaches. It contains, among other things: an outline of Rameau’s harmony theory, as well as functions, steps, “octave rule” and fifth-fall sequence, a comprehensive exposition of historical cadences, counterpoint and lineation as central aspects of the Bach movement, detailed considerations of the methodological approach, an answer to the question of the authenticity of numerous “Bach movements”. The book is intended for teachers and students as well as for ” experts and enthusiasts ” who regard the chorale movement as the basis of a stylistic movement theory and who would like to deepen their knowledge of it.