Polydiatonism is contemporary music. It is based on the tradition and scale structure of Western music. Polydiatonism uses heptatonic scales. The composing method is polyphonic. Polydiatonism is based on the interactions between independent melodies, and it does not include anything related to chords or chord progressions.
According to the same principle how diatonic scales aka church modes that belongs into the heptatonic scales are formed it is possible to make two more similar heptatonic scales more. All of these are used in polydiatonism. Because of this expanded concept of diatonic scales and polyphonic way to compose, the composing method is called Polydiatonism.
The work of composition consists of three phases. At first the composer creates the Binding. This is the actual composition, but it has not been made for playing or performing. For performing the score is arranged from the Binding. Finally, the score is performed. All these stages can be made by same or different person or group.
Polydiatonic music seeks to realize the idea of absolute music on the principle of autonomous music. For composing it has a compilation of rules based on human cognitive abilities and the inner laws of music. Absolute music goals are best achieved by following the rules as closely as possible.
The musical starting point for polydiatonism is the Comparison Principle. It compares everything heard with what was heard before. On the basis of the magnitude of the difference i.e. the Degree of Change, one will get known the parts of the composition and its the architectural structure.