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F major · Secondary dominants

Secondary dominants in F major

A secondary dominant is the dominant seventh of a chord other than the tonic. F major has five: D7 to Gm, E7 to Am, F7 to B♭, G7 to C and A7 to Dm. Between them they bring in F♯, G♯, B, E♭ and C♯, notes F major does not have, and those outside notes are what you hear pulling toward each target.

All five secondary dominants in F major

  • D7V7/iiGmii
    Notes
    Outside the key
    Leading tone

    D7 is the dominant of G minor. It pulls there by a falling fifth. 1 voice holds, 3 move, 8 semitones of motion in all.

  • E7V7/iiiAmiii
    Notes
    Outside the key
    Leading tone

    E7 is the dominant of A minor. It pulls there by a falling fifth. 1 voice holds, 3 move, 8 semitones of motion in all.

  • F7V7/IVIV
    Notes
    Outside the key
    Leading tone
    A

    F7 is the dominant of B♭ major. It pulls there by a falling fifth. 1 voice holds, 3 move, 7 semitones of motion in all.

  • G7V7/VCV
    Notes
    G B D F
    Outside the key
    B
    Leading tone
    B

    G7 is the dominant of C major. It pulls there by a falling fifth. 1 voice holds, 3 move, 7 semitones of motion in all.

  • A7V7/viDmvi
    Notes
    Outside the key
    Leading tone

    A7 is the dominant of D minor. It pulls there by a falling fifth. 1 voice holds, 3 move, 8 semitones of motion in all.

The one that is not secondary

C7 is V7 of F major itself: the primary dominant, resolving to the tonic, F. Every chord above borrows that relationship and points it at a different chord of the key. Its leading tone, E, is already in the key, which is why it needs no accidental and the others do.

How to hear one

A secondary dominant sounds like the music is about to change key and then does not. Listen for the note outside the key: it is a semitone under the chord it is heading for, or a semitone above the third it falls to, and the ear hears it as pulling. Play each one above, then play the target on its own, and the pull is obvious in reverse.

In the app, section 2 trains this as three skills: naming the V of any chord, hearing the tonicisation, and resolving a secondary dominant to the right chord.

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