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Rimsky-Korsakov, Practical Manual of Harmony in English

Nikolai Rimsky-Korsakov · section 84 of 96

The Augmented Fifth Chord (*)

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§ 80.— 1) It is produced by raising the fifth of a major triad, or by lowering the root of a minor triad:

[Example]
Fig. 346 · See it in the reader

REMARK.— The augmented fifth chord (2) cannot occur in the minor key; see the spelling of the chromatic scale (§ 66).

2) Apart from its property of being formed by a chromatic passing note, the augmented fifth chord may be used independently when it is prepared by the very chord into which it resolves:

[Example]
Fig. 347 · See it in the reader

3) It may also occur in inversion:

[Example]
Fig. 348 · See it in the reader