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For color explanations see Relative tension
Pick a starting note, skip a note, use a note, skip a note, use a note.

There are 7 Basic Chords in the Major Scale.  
   To see all seven we'll need to extend the scale another octave.  
   The colors show the relative tension of each chord note.

chord building 1-7

These 7 chords make up one Key.  Now we need to re-number each individual chord.  

       chord numbers

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