In AP Music Theory, the V6/5 chord is the dominant seventh chord (V7) in first inversion, meaning the third of the chord (the leading tone of the key) is in the bass. The figures 6/5 show the intervals above that bass note, and the chord resolves strongly to a root-position tonic chord.
V6/5 is shorthand for a dominant seventh chord in first inversion. Take V7 in any key (in C major, that's G-B-D-F), then put the chord's third in the bass instead of its root. Now B is on the bottom, and B is the leading tone of the key. The Arabic numerals 6/5 describe the intervals above the bass: a sixth (B up to G) and a fifth (B up to F). So the Roman numeral V tells you the chord is built on scale degree 5, and the 6/5 figures tell you it's a seventh chord with its third in the bass.
That bass note is the whole point. With the leading tone in the bass, the chord practically pulls itself up to tonic. The bass moves up by half step (leading tone to tonic), and the chordal seventh, sitting a fifth above the bass, resolves down by step. This makes V6/5 a smooth, almost inevitable way to approach a root-position I chord. The full family of seventh-chord inversions runs root position (7), first inversion (6/5), second inversion (4/3), and third inversion (4/2), where the seventh itself lands in the bass (PIT-2.D.1).
V6/5 lives in Topic 3.5 (Seventh Chord Inversions and Figures) in Unit 3: Music Fundamentals III. It directly supports learning objective AP Music Theory 3.5.A, which asks you to identify seventh chords using Roman and Arabic numerals that show the root's scale degree, the chord quality, and the bass note. V6/5 is the workhorse example of this skill because it's the most common inverted seventh chord in actual tonal music. If you can decode V6/5 (dominant function, seventh chord, third in the bass, leading tone on the bottom), you can decode any figured Roman numeral. The skill also feeds forward into harmonization and part-writing work, where choosing V6/5 instead of root-position V7 is how composers keep a bass line stepwise and singable.
Keep studying AP Music Theory Unit 3
Visual cheatsheet
view gallerySeventh Chord (Unit 3)
V6/5 only exists because V7 has four notes. A triad's first inversion is just labeled 6, but adding the chordal seventh creates the extra interval that turns the figure into 6/5. Same inversion idea, one more note to track.
Inversion (Unit 3)
The figures are really just a bass-note address. 7 means root in the bass, 6/5 means third in the bass, 4/3 means fifth in the bass, and 4/2 means the seventh itself is in the bass (that third inversion is the one PIT-2.D.1 calls out specifically).
Dominant Chord (Unit 3)
Inverting V7 doesn't change its job. V6/5 still has dominant function and still wants to resolve to tonic. It just does it with the leading tone in the bass, so the bass line rises by half step into the tonic note instead of leaping down a fifth.
ii 6/5 chord (Unit 3)
The same 6/5 figures attached to a different Roman numeral. The ii6/5 is the supertonic seventh chord in first inversion, and it typically comes right before the dominant. Together they show that 6/5 describes the inversion, not the chord's identity or function.
This is a spell-it-and-label-it skill. Multiple-choice and aural questions give you a key and a figured Roman numeral and ask you to identify the chord, its quality, or its bass note. For example, a question might ask for the bass note of V6/5 in Bb major. Work it in steps. V in Bb major is built on F, so V7 is F-A-C-Eb. First inversion puts the third in the bass, so the answer is A, which is also the leading tone of Bb major. The reverse direction shows up too, where you see a chord written in a score or hear it played and have to produce the correct Roman numeral with figures. In later harmony and part-writing contexts, you also need to resolve it correctly, with the bass leading tone moving up to tonic and the chordal seventh resolving down by step.
The figures 6/5 mean FIRST inversion of a seventh chord, with the third in the bass. Second inversion of a seventh chord is labeled 4/3 and puts the fifth in the bass. A common trap is assuming 6/5 means the fifth is in the bass because a 5 appears in the figure. It doesn't. The numbers describe intervals above the bass, not which chord member is on the bottom. For V6/5, the bass is the chord's third, which is the leading tone of the key.
V6/5 is the dominant seventh chord in first inversion, which puts the third of the chord, the leading tone of the key, in the bass.
The Arabic numerals 6/5 name the intervals above the bass note, a sixth and a fifth, not which chord member is on the bottom.
To find the bass note, spell V7 in the key and take its third. In Bb major, V7 is F-A-C-Eb, so the bass of V6/5 is A.
V6/5 resolves to a root-position tonic chord, with the bass leading tone rising by half step and the chordal seventh stepping down.
The full inversion family for seventh chords is 7 (root position), 6/5 (first), 4/3 (second), and 4/2 (third, with the seventh in the bass).
The 6/5 figures work the same on any Roman numeral, so ii6/5 is just the supertonic seventh chord in first inversion.
It's the dominant seventh chord (V7) in first inversion, with the chord's third in the bass. The 6/5 figures show the intervals of a sixth and a fifth above that bass note. In C major, V6/5 is spelled B-D-F-G with B in the bass.
No. This is the most common mistake with this label. The 5 in the figure refers to an interval above the bass, not the chord member in the bass. V6/5 puts the THIRD of the chord in the bass, which is the leading tone of the key. The fifth-in-the-bass version is V4/3.
A. The dominant seventh in Bb major is F-A-C-Eb, and first inversion puts the third (A) in the bass. A is also the leading tone of Bb major, which is why this exact question shows up in practice sets.
V6 is the dominant TRIAD in first inversion (three notes), while V6/5 is the dominant SEVENTH chord in first inversion (four notes, including the chordal seventh). Both have the leading tone in the bass, but only V6/5 contains the seventh that must resolve down by step.
To a root-position tonic chord (I or i). The bass note is the leading tone, so it rises by half step to tonic, while the chordal seventh resolves down by step. That double pull is what makes V6/5 such a strong approach to tonic.
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