Originally Posted by: snojonesso what I want to know is how come extended chords (like 9ths,11th and 13ths) sound so mellow when are basicaly including all the disonant scale degrees to the chord?
Many extended chords are simply reinforcing the natural overtone series already present in any musical tone. IOW, not dissonant per se, only a natural part of what already is present in the chord.
https://en.wikipedia.org/wiki/Harmonic_series_(music)
And of course the context of the progression, voicing & timbre also makes a difference!
