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There is a Natural  Chord  progression that all of the Keys use, Below we show you the Natural Chord Progression in the Key of "C". All Keys have Only 7 basic chords, That's it, Just seven!, For the example we will start from the "C Major Chord" this shows you the extensions too. (7ths, 9ths, and 11ths)

You can also see the powered extensions on our Chord Formula worksheet

Chord name---------------------Notes used

C major ------------------------- C E G

C major 7th--------------------- C E G + B (compare to E minor 13th)

C major 9th--------------------- C E G + D

C major 11th-------------------- C E G + F

C major 13th--(not really) ---- C E G + A

Looking at the C major 13th, You should notice that it uses the notes C E G A---- compare it to the A minor 7th below!!!!

A minor -------------------------- A C E

A minor 7th---------------------- A C E + G

A minor 9th---------------------- A C E + B

A minor 11th--------------------- A C E + D

A minor 13th--(not really)------ A C E + F

This time the A minor 13th is the same as F major 7th!!!!(They use the same notes)

F major---------------------------- F A C

F major 7th----------------------- F A C + E

F major 9th----------------------- F A C + G

F major 11th---------------------- F A C + B

F major 13th---(not really)------ F A C + D

Now the F major 13th uses the same notes as the D minor 7th!!!

D minor --------------------------- D F A

D minor 7th----------------------- D F A + C

D minor 9th----------------------- D F A + E

D minor 11th---------------------- D F A + G

D minor 13th ---(not really)----- D F A + B

Now the D minor 13th has the exact same notes as the B diminished 7th below!!!

B diminished ---------------------- B D F

B diminished 7th------------------ B D F + A

B diminished 9th------------------ B D F + C

B diminished 11th----------------- B D F + E

B diminished 13th--(not really)-- B D F + G

This time the B diminished chord progress naturally to the G major--- The G major 7th has the same notes as the B diminished 13th.

G major------------------------------ G B D

G major 7th------------------------- G B D + F

G major 9th------------------------- G B D + A

G major 11th------------------------ G B D + C

G major 13th--(not really again)-- G B D + E

The G major 13th uses the same notes as the E minor 7th!!!

E minor ------------------------------ E G B

E minor 7th-------------------------- E G B + D

E minor 9th-------------------------- E G B + F

E minor 11th------------------------- E G B + A

E minor 13th---(could be)---------- E G B + C

AT the top of the Page you should notice the C major 7th which uses the exact same notes as the E minor 13th. The 7ths and 9ths are the most commonly used Extensions - 11ths and the so-called 13ths are less common.