This website summarises a new theory which explains how chord progression patterns create musical phrase structures in tonal (and tonally influenced) music, similar to sentence structures in natural language. It also explains the relationship between chord progressions and voice leading.

The site now includes full musical analyses which use the theory to explain the structure of whole musical compositions including the style, period and mood of the music.

The site includes Animated Demos, a Book Outline and an outline Thesis section which graphically illustrates the evidence for the theory. There is also a section on how chord progressions work in Pop and Rock Music and an example of how to harmonise a melody.

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