Keywords: Keys in dozenal clock.svg The twelve keys of the octave arranged in a duodecimal clock These are the numbers of each key e g 40 for c<sup>1</sup> mod 12 <br> See key numbers in Piano key frequencies <small> https //en wikipedia org/w/index php title Piano_key_frequencies oldid 612861909 oldid </small> Thin lines are minor thirds major sixths thicker lines are major thirds minor sixths <br> The lines of the gray dodecagram are fifths fourths <br> Every triad is a triangle of two thirds and a fifth thumb left 733px The 12 keys in the octave and their key numbers own Mate2code Music diagrams with duodecimal signs Clocks without hands Clocks with Arabic numerals Twelve pointed stars Cc-zero |