The key I am in is B flat Major, and the progression I have is A2, G3, E4, C5, which is the vii7 chord progression. Keeping the sharing notes, what would be the correct V chord? Would it be V6/5, V2, V3/4, or V7?
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Are A2, G3, E4, and C5 the notes making up a single chord? (And do you mean Eb5?)– AaronCommented Mar 19, 2021 at 3:26
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2 Answers
The V chord in Bb major is F-A-C-Eb. Since the given vii7 chord has A as its lowest pitch, the corresponding V chord would be A-C-Eb-F, which is V6/5.
In general, viio7 and V7 correspond as follows:
viio7 ~ V6/5 viio6/5 ~ V4/3 viio4/3 ~ V4/2
viio4/2 does not correspond to a V7 chord as it has scale degree 6 as the lowest pitch, and the V7 chord does not contain that pitch.
For a vii7 chord in major (i.e., a half-diminished chord), the correspondence is similar, except that vii7 does not typically serve a dominant function. Nevertheless, the correspondence would be according to the lowest note of the chord.
You've spelled an a minor 7th chord, which doesn't live in B♭ due to the E♮. However, it DOES live in the key of F, so I think the simplest progression would be something like:
ACEG (amin7) -> ACE♭F (F7 / A) -> B♭B♭DF. (B♭)
answered Mar 19, 2021 at 7:07