Seventh Chords Construction // Half Diminished Seventh Chords (4 of 5)
Run time: 4m 06s | Release Date: January 1st, 2021
Section 1 - "Half Diminished Seventh Chords"
Throughout this video series we have learned how the two components which construct a seventh chord are a triad and an interval of a seventh above its root note. A half diminished seventh chord is called so because only the triad component is diminished, while the interval of a seventh is minor.
Now, the notes of a diminished triad are very similar to the notes of a minor triad with the exception of a flattened fifth. For example, if the notes of an A minor triad are A, C, and E, then the notes of a diminished triad would be A, C, and E-flat. By adding an interval of a minor seventh above the note A to the notes of an A diminished triad we would then be playing an A half diminished seventh chord.
Likewise, the notes of a D diminished triad are D, F, and A-flat. Playing these notes together with the note C would create a D half diminished seventh chord.
Section 2 - "Minor Seventh Flat Five"
Another name for a diminished seventh chord is minor seventh flat five. In other words, a half diminished seventh chord may also be looked at as being a minor seventh chord with a flattened fifth.
Here are the notes of a C minor seventh chord. If we simply flatten the note G by one half step to the note G-flat we will have created a C minor seventh flat five chord.
In that same way, the notes of an E minor seventh chord are E, G, B, and D. By flattening the note B one half step to the note B-flat we would then be playing the notes of E minor seventh flat five, also known as E half diminished seventh.
Section 3 - "Pattern of Intervals"
Another way to construct a half diminished seventh chord above any given note is by following a specific pattern of intervals. The interval pattern which constructs a half diminished seventh chord is minor third, minor third, and Major third.
For example, an interval of a minor third above the note B is the note D, another minor third above the note D is the note F, and an interval of a Major third above F is the note A. Here we can see that the notes of a B half diminished seventh chord are B, D, F, and A. Follow this pattern of intervals to create a half diminished seventh chord above any note.
Section 4 - "Wrap Up"
In the next and final video in this series we are going to discuss how to construct a fully diminished seventh chord.
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. Therefore, if the notes of an A minor triad are A, C, and E, 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. In other words, if an interval of a minor seventh above the note A is the note G, then an interval of a diminished seventh above the note A is the note G-flat.