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Formulas
for all types of 3 note chords
major
= 1 3 5
minor = 1 3
5
augmented = 1 3 5
diminished = 1 3
5
sus2 = 1 2 5
sus4 = 1 4 5 |
So a C chord is C(1) E(3) G(5).
major =
1 3 5 (C E G)
Knowing that the formula for minor is 1 3
5, you will lower the E(3) to an E ( 3)
for a Cm chord.
minor
= 1 3
5 (C E
G)
Augmented is 1 3 5,
so in a C augmented you will raise the G(5) to a G ( 5).
augmented
= 1 3 5
(C E G )
A diminished chord is 1 3
5,
so for a C diminished you will lower the E(3) to an E ( 3)
and the G(5) to a G ( 5).
diminished
= 1 3
5
(C E
G )
We will look at sus2 and sus4 chords shortly.
Page 1, How to spell different 3 note chords intro
Page
3, examples for major, minor, augmented and diminished 
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