Rules for chords
From the Jazz Language by Dan Haerle
Notes needed for the chord
Root- May be included for strength or may be omitted
3rd - Important color tone, normally present except in sus4 chord, (also the sus2 chord, but he left it out)
5th - May be omitted unless it is altered
7th - Important color tone, normally present except in 9/6 chord
9th - Optional color tone unless specifically called for
11th - Optional color tone (same as 9th)
13th - Optional color tone (same as 9th)
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