In general, about twenty-five variations are popular. Understanding this complex assortment is not difficult. The same rules apply to all chords. In general, two groups include all extended chords. We will look at both variations.
Extended chords follow the natural construction of the original scale structure.
Of course, one primary exception exists. Tones are generally added in a specific order. To this order we add tones in 3rds. All of these tones are not usually played in one chord. Basically, the 7 th tone and one additional tone are added to the basic triad.