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Extended Chords: The 9th Chord, 11th Chord, 13th Chord
Meanwhile, the best way to envision where the notes come from to create extended chords such as the 9th chord, 11th chord, and 13th chord, is to consider octaves as “overlapping.” So, for example, in the key of C,
the note “C” is scale note 1
the note “D” is scale note 2
the note “E” is scale note 3
When you get to the end of the scale (the “C” at the end of the octave is the 8th note of the scale), you just continue on with higher numbers. So the note “D” becomes the 9th note of the scale, in addition to being the 2nd note. The note F becomes the 11th note (in addition to the 4th), and the A becomes the 13th note. Like this:
