Seventh Chords Construction | Fully Diminished Seventh Chords (5 of 5)

A fully diminished seventh chord consists of a diminished triad with an interval of a diminished seventh above the root note.

As we learned in the previous video a diminished triad is essentially a minor triad with a flattened fifth.

AminorTriad.png

Therefore, if the notes of an A minor triad are A, C, and E,

AdimTriad.png

then the notes of an A diminished triad would be A, C, and E-flat.

Now, an interval of a diminished seventh can be thought of as being a flattened minor seventh interval.

MinorSeventh_AG.png

In other words, if an interval of a minor seventh above the note A is the note G,

DiminishedSeventh.png

then an interval of a diminished seventh above the note A is the note G-flat.

By playing the notes of an A diminished triad together with an interval of a diminished seventh above the note A we will have constructed an A fully diminished seventh chord.

Adim7.png