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Practising with Dominant seventh Chords.
It is time now, that one tries to understand the circle of fifths concept. We have seen before, that the function of the dominant chord is to "smoothly land" on the tonic chord by an opposite motion from its seventh and third degree going upwards and downwards to the tonic chord. (See Chord II). The example below starts from C and leaps counterclockwise to all the Circle of Fifths chords. (See picture below).
- C chord (I degree) is the starting Key. (in red)
- Next, we have C7 chord (dominant V7) that belongs to F Key and lasts two bars. (in orange)
- C7 resolves on F by a semitone motion. (thanks to the E - Bb Tritone)
- F becomes now the New tonic or key (I).
- Next, we have F7 chord (dominant V7) that belongs to Bb Key and lasts two bars. (in green)
- F7 resolves on Eb by a semitone motion. (thanks to the A - Eb Tritone) Eb becomes the New tonic or key (I).
- We can carry on this motion until we reach C again.
- This technique is called, modulating to the dominant using neighbouring chords.
- Full video below.
The Circle of Fifths scales practice will give an example of using a scale with its relevant chord, following the Circle of Fifths counterclockwise. Another point here to mention, is, tritone sharing. G7 and Db7 share the same tritone. (See Tritone reference table below)
The Dominant Substitutes.
Another point here to mention is Tritone substitution. The tritone substitution can be performed by exchanging a dominant 7th chord for another dominant 7th chord placed in the opposite position. See below. G7 -- D flat7. See Circle of Fifths. It is then possible, to use chord substitution (SubV7) to improvise in G7 under a D flat7 chord.
Tritone Sharing exemple: in red, F note, in G7 and Db7 chords. In brown, B note in G7 and Db7 chord.
The Dominant Seventh (V7) chords and The Substitute Dominant Chords (Sub V7) Table:
On the left row, we find, the dominant (V7) chords and on the right row, we have, the Subdominant chords (SubV7). See Tritone in the middle of the table. Notice, that C7 and F#7 share the same triton, however not in the same position or sense.
One easy way to find any Tritone: For instance, D7 that resolves on G.
- Take the major third of D7, namely F#.
- Take the minor seventh of D7, namely C
- So you have as a Tritone, F# and C
In the video below, and for reading convenience, Tritones in all Dominant 7th chords are always placed at the same place.