和声、复调、配器和曲式常被称为作曲技术理论的“四大件”。称为“技术理论”,说明这四大件既不是单纯的技术,也不是单纯的理论,而是指导作曲技术的理论。曲式是音乐作品的结构模式。在宏观方面,各种作品都有共同的结构原则和结构模式,如一部曲式、二部曲式、三部曲式、复三部曲式、复二部曲式、回旋曲式、变奏曲式、奏鸣曲式、奏鸣回旋曲式等等;而在微观方面,则每 Harmony, polyphony, fittings and music are often referred to as the “big four” of composer technology. Known as the “theory of technology,” that these four pieces is neither a mere technique nor a pure theory, but a theory that guides the art of composition. Music is the structure of the music model. On the macro level, all kinds of works have common structural principles and structural modes, such as one type of music, two types of music, three types of music, three parts of music, two parts of music, Sonata, Sonata Rondo, and so on; while on the micro side, each