And Byrd it is more than just The Solar System and Man that follow these simple rules, Music is the most obvious and in your face what with it's 7 notes, and major 7th and minor 9th and so on.

See here: [en.wikipedia.org]

And this:

Extended Chords
7th - 9th - 11th - 13th

Extended chords (or higher numbered chords) have notes in addition to the basic triad. These are called extensions... i.e. 7th, 9th, 11th, 13th.

Here are the basic guidelines regarding extended chords:

7th = triad + 7th
9th = triad + 7th + 9th
11th = triad + 7th + 9th + 11th
13th = triad + 7th + 9th + 11th + 13th

There are other guidelines and rules of the road regarding extended chords. Look at the following examples will point out.

From this website: [www.practical-chords-and-harmony.com]

It is said quite often that the Lord works in mysterious ways. I intend to totally disprove that !


Cheers
Don Barone



"There is nothing as impenetrable as a closed mind"
and ..." if everything is a coincidence what is the point of studying or measuring or analyzing anything ?" db