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Rimsky-Korsakov, Practical Manual of Harmony in English

Nikolai Rimsky-Korsakov · section 8 of 96

Triads

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A) Natural major mode: triads on each degree of C major
Fig. 28 · See it in the reader
B) Harmonic major mode: triads on each degree of C harmonic major; the augmented triad on VI is bracketed
Fig. 29 · See it in the reader
C) Natural minor mode: triads on each degree of A natural minor
Fig. 30 · See it in the reader
D) Harmonic minor mode: triads on each degree of A harmonic minor; the augmented triad on III is bracketed
Fig. 31 · See it in the reader

Leaving aside the augmented triad on the sixth degree of the harmonic major mode and the one on the third degree of the harmonic minor mode, there are nine different triads in the two major modes and nine in the two minor modes.

The three chords of the strong degrees, or chords of the first order, in the major scale are:

The tonic chord:

Tonic triad of C major
Fig. 32 · See it in the reader

The subdominant chord:

Subdominant triad of C major
Fig. 33 · See it in the reader

The dominant chord:

Dominant triad of C major
Fig. 34 · See it in the reader

The three chords of the first order in the harmonic minor scale are:

The tonic chord:

Tonic triad of A minor
Fig. 35 · See it in the reader

The subdominant chord:

Subdominant triad of A minor
Fig. 36 · See it in the reader

The dominant chord:

Dominant triad of A harmonic minor
Fig. 37 · See it in the reader