This is the second Greek edition of Schoenberg's latest comprehensive theoretical work. It represents the composer's final thoughts on classical and romantic harmony.

The initial sections recap the principles set forth in 'Harmony'. The final chapters open new paths, as they analyze the system of tonal relationships within the structure of entire pieces and confirm the principle of 'monotonicity', showing that all transformations within a piece are merely deviations and not denials of its main tonality.