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{|class="wikitable"
! Member Notes !! Spelling !! Ex.Example
|-
| (R M3 P5 m7) || R{{7}} (R = Root Note) || G{{7}}, (G B D A)
{|class="wikitable"
! Member Notes !! Spelling !! Ex.Example
|-
| (R M3 P5 M7) || R{{maj}}{{7}} (R = Root Note) or R maj{{7}} || C{{maj}}{{7}}, (C E G B) or C maj{{7}}
{|class="wikitable"
! Member Notes !! Spelling !! Ex.Example
|-
| (R m3 P5 m7) || Rm{{7}} (R = Root Note) || Dm{{7}}, (D F A C)
{|class="wikitable"
! Member Notes !! Spelling !! Ex.Example
|-
| (R m3 d5 m7) || R{{hdim}}{{7}} (R = Root Note) || B{{hdim}}{{7}}, (B D F A)
{|class="wikitable"
! Member Notes !! Spelling !! Ex.Example
|-
| (R m3 d5 d7) || R{{dim}}{{7}} (R = Root Note) || B{{dim}}{{7}}, (B D F A{{f}})
{|class="wikitable"
! Member Notes !! Spelling !! Ex.Example
|-
| (R m3 P5 M7) || Rm{{maj}}{{7}} (R = Root Note) ''or'' Rm maj{{7}} || Dm{{maj}}{{7}}, (D F A C{{s}}) ''or'' Dm maj{{7}}
{|class="wikitable"
! Member Notes !! Spelling !! Ex.Example
|-
| (R M3 a5 M7) || R+{{7}} (R = Root Note) || C+{{7}}, (C E G{{s}} B)
''The most common use of 7th chords comes in the form of V{{7}} - I (or i) progressions.''
As noted for the augmented 7th and half diminished 7th Chords, the 7th helps add consonance and lightens the feel of the basic triad, while adding a richer harmony to it and making it feel more complex. complExample I recommend always using the half diminished 7th over the triad when diatonic to the current key, especially as the vii{{hdim}}{{7}} chord of a major key.
Sevenths can also be desirable for voice leading purposes. Or it may simply be implied by a melody line.