I consider known seventh chords symbols as too intricate
(illogical,opaque) and suggest the following symbols:
Chord name Triad type Seventh type Symbol
major seventh major major C7aa or
C7a
dominant seventh major minor C7ai
minor seventh minor minor C7ii or
C7i
diminished seventh diminished diminished C7dd
or C7d
half
diminished seventh diminished minor
C7di
augmented
major seventh augmented
major C7ua
augmented seventh augmented minor
C7ui
minor
major seventh minor
major C7ia
Apparently a is for major, I - for minor, d - for diminished, u -
augmented.
If root note has accidental, e.g. C# then symbols would be C#7aa,
C#7ai
and so on.
The table may be expanded e.g. with using s for sustained chords.
Best Regards
Yuri Vilenkin
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