Image: Keys in dozenal clock
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Description: The twelve keys of the octave arranged in a duodecimal clock These are the numbers of each key (e.g. 40 for c1) mod 12. See key numbers in Piano key frequencies (oldid). Thin lines are minor thirds (major sixths). Thicker lines are major thirds (minor sixths). The lines of the gray dodecagram are fifths (fourths). Every triad is a triangle of a minor and a major third and a fifth. See e.g. File:Octave circle.svg.
The 12 keys in the octave and their key numbers
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