Combining Chords II
Sometimes the tones from the second chord do not fit well in the new combined chord. Their new functions form awkward relationships with the original tones.

For example:

E major chord plus F major chord combine to give E twelve flat nine flat thirteen

The root of the second chord (F), becomes the minor second of the first chord (E). The third (A) becomes the twelth and the fifth (C) is now the minor thirteenth of the combined chord.

These relationships result in a number of 'awkward' intervals (e.g. minor second: G#/A) which give the chord a discordant property.

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