Music theory- Chords

Major Triad

M3m3

Minor Triad

m3M3

Diminished triad

m3m3

Augmented triad

M3M3

Diatonic qualities for major keys

I ii iii IV V vi vii°

Diatonic qualities for minor keys

i ii° III iv v VI VII

Triad first inversion

I^6

Triad second inversion

I^6/4

A 7th chord is a…

Major triad plus a major third on top

Major 7th- MM

M3 m3 M3

Dominant 7th- Mm

M3 m3 m3

Minor 7th- mm

m3 M3 m3

Half diminished 7th- dm

m3 m3 M3

Fully diminished 7th- dd

m3 m3 m3

I

1 3 5 (7)

II

2 4 6 (1)

III

3 5 7 (2)

IV

4 6 1 (3)

V

5 7 2 (4)

VI

6 1 3 (5)

VII

7 2 4 (6)

Root position 7th

I^7

First inversion 7th

I^6/5

Second inversion 7th

I^4/3

Third inversion 7th

I^4/2