Which of the following is a first-inversion seventh chord?

Question

BlackTom AI · Accepted Answer

A seventh chord in first inversion has the third of the chord in the bass. In other words, if the chord is spelled R–3–5–7, the bass will be the 3 (not the root, 5, or 7). The vertical intervals above that bass note (measured from the bass) will therefore form a 6th, a 5th, and a 3rd (commonly notated as 6–5 for a 6/5 first-inversion seventh).

Step-by-step identification procedure:
1. Identify the bass (lowest) note in each given voicing.
2. Identify the other chord tones above it and determine the complete chord spelling (root, third, fifth, seventh).
3. Check whether the bass is the chord’s third. If it is, the chord is a first-inversion seventh. If the bass is the root, fifth, or seventh, the chord is root position, second inversion, or third inversion, respectively.
4. Verify the intervals above the bass are a sixth, a fifth, and a third (confirming 6–5–3 structure).

Applying this to the four examples (visual analysis of each option):
- Option 1: The lowest pitch is the root of the stack (lowest note is the chord root). That makes this a root-position seventh chord, not first inversion.
- Option 2: The lowest pitch is the fifth of the chord (the stacked notes above include the root and third). That corresponds to the second inversion (4–3), not first inversion.
- Option 3: The bass note is the chord’s third. The upper tones complete the seventh chord (you can read the stacked intervals above that bass as a 6th, a 5th and a 3rd), which is precisely the signature of a first-inversion seventh (6–5).
- Option 4: The bass is the seventh of the chord (lowest pitch is the seventh), which makes this the third inversion (4–2), not the first inversion.

Why the correct answer is correct: Option 3 places the third of the chord in the bass and the other chord members above it form intervals of a sixth, a fifth, and a third above that bass. That is the textbook definition of a first-inversion seventh chord (notated in figured-bass as 6–5).

Therefore the correct choice is the third option (the one with the third in the bass). This matches the intended correct answer.

Which of the following is a first-inversion seventh chord? 单项选择题

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