Nikolai Rimsky-Korsakov · section 30 of 96
The Sixth Chord of the Second Degree in the Major and Minor Modes
Read and hear this section in the playable edition →b) — 1) The sixth chord of the second degree may be used in minor as well as in major as a subdominant harmony, in cadences of the second kind after the triad of the first degree or its first inversion, and also in a turn of phrase that has the character of a cadence.
2) Use the sixth chord of the second degree with the root in the upper part.
3) Double the third of the root, or the root; but before the cadential six-four chord, double only the third of the root.

REMARK. — Doubling the fifth of the root in the sixth chord of the second degree is possible only in the major mode:
