The harmonic wheel in four steps

Nuño Fernández, Luis; The Harmonic Wheel is a physical tool that combines a Tonnetz transformed into a polar grid with a plastic disc containing the lines that define the major, harmonic and melodic minor scales, together with the scale degrees and the symbols of the corresponding seventh chords. The Harmonic Wheel is a powerful and versatile tool for analyzing and composing music, as well as providing an efficient mnemonic notation. http://hdl.handle.net/10251/194203