Piano Theory Blog #7: Dec. 6th, 2019
- Skylar Ji
- Dec 6, 2019
- 2 min read
Today, I've started to learn more in-depth about chords, specifically about 7th chords, which is basically a combination of a triad (in the last blog) with a dominant 7th chord. 7th chords usually consist of a series of four notes instead of three. There are five types of 7th chords:
A dominant 7th chord is a combination of a major triad chord and a minor seventh. A minor 7th is three half steps away from the last note in the corresponding major triad. Ex. a C dominant 7th chord consists of the notes C-E-G-Bb, with Bb, the minor 7th from C, being three half steps away from G.
A major 7th chord is a combination of a major triad chord and a major seventh. A major 7th is four half steps (an extra half step) away from the last note in the corresponding major triad. Ex. a C major 7th chord consists of the notes C-E-G-B, with B, the major 7th from C, being four half steps away from G.
A minor 7th chord is a combination of a minor triad chord and a minor seventh. A minor 7th is three half steps away from the last note in the corresponding minor triad. Ex. a C minor 7th chord consists of the notes C-Eb-G-Bb, with Bb, the minor 7th from C, being three half steps away from G.
A half-diminished 7th chord is a combination of a diminished triad chord and a minor seventh. In this case, the minor 7th is four half steps away from the last note in the corresponding diminished triad. Ex. a C half-diminished 7th chord consists of the notes C-Eb-Gb-Bb, with Bb, the minor 7th from C, being four half steps away from Gb.
Finally, a fully-diminished 7th chord is a combination of a diminished triad chord and a diminished seventh. A diminished 7th is three half steps away from the last note in the corresponding diminished triad. Ex. a C diminished 7th chord consists of the notes C-Eb-Gb-Bbb, with Bbb, the diminished 7th from C, being three half steps away from Gb.
Website Used: https://www.musictheory.net/lessons/45
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