An unresolved seventh is an 18th-century voice-leading error in which the chordal seventh fails to resolve down by step into the next chord. AP Music Theory's conventions (PIT-4.A.8) require every chordal seventh to resolve by descending step, so anything else counts as unresolved.
The seventh of a seventh chord is a built-in dissonance. In a V7 chord in C major (G-B-D-F), the F sits a seventh above the root and clashes against it, and 18th-century style treats that clash like a ball at the top of a ramp. It has to roll down. The chordal seventh resolves by descending step, so F moves down to E, the third of the tonic chord. When the voice carrying the seventh does anything else, leaps away, holds, or moves up, you have an unresolved seventh.
This is the flip side of the rule in the CED's essential knowledge for Topic 4.4. PIT-4.A.8 states that all chordal sevenths should resolve by a descending step to avoid an unresolved seventh. So the term names the error, not a stylistic choice. Your thin-definition instinct might be that the seventh resolves "to the tonic," but that's not it. The seventh resolves down by step to whatever note that lands on (in V7 to I, scale degree 4 falls to scale degree 3). The CED also governs how you get into the seventh in the first place. PIT-4.A.7 says approach it by common tone or by step, with leaps allowed only when context forces them.
Unresolved sevenths live in Topic 4.4 (Voice Leading with Seventh Chords) in Unit 4, under learning objective AP Music Theory 4.4.A, which asks you to identify and apply 18th-century voice-leading procedures through score analysis, error detection, writing exercises, and contextual listening. That list is exactly how this term shows up. In error detection you spot the seventh that didn't step down. In writing exercises you make sure yours does. Seventh chords are everywhere in the part-writing FRQs (dominant sevenths especially), so handling the chordal seventh correctly is one of the highest-frequency skills in the whole course. Miss it once and it's a deduction; miss the habit and it bleeds points across an entire chorale.
Keep studying AP Music Theory Unit 4
Visual cheatsheet
view galleryChordal Seventh (Unit 4)
The chordal seventh is the note itself, the tone a seventh above the root. The unresolved seventh is what happens when that note is mishandled. PIT-4.A.7 tells you how to enter it (common tone or step) and PIT-4.A.8 tells you how to exit it (down by step). Break the exit rule and you've created the error.
Dissonance and Resolution (Unit 1 and Unit 4)
The seventh is dissonant against the root, and dissonance in 18th-century style demands resolution. The unresolved seventh is the clearest example in the course of a dissonance whose expected resolution never arrives, which is why your ear hears it as a loose thread.
Parallel Fifths and Parallel Octaves (Unit 4)
These are the other classic part-writing errors graders hunt for. Parallels are errors of motion between two voices, while an unresolved seventh is an error of resolution in a single voice. Your error-detection checklist needs both.
Common Tone (Unit 4)
Common tones are the preferred way to approach a chordal seventh. If the seventh is already sounding in the previous chord, hold it, then resolve it down by step. Smooth in, smooth out.
Multiple-choice questions test this as error identification. A typical stem describes a specific voice, like a soprano singing the chordal seventh of V7 and then leaping down a fourth instead of stepping down, and asks you to name the error. Other stems contrast the seventh's resolution with the leading tone's resolution in a V7 to I progression, so know both directions cold. On the free-response side, the part-writing questions (like the 2025 SAQ that asks you to complete a bass line with Roman and Arabic numerals following 18th-century voice-leading procedures) are scored against these conventions, and an unresolved seventh is a point-losing error. Practical move for the exam. Every time you write a seventh chord, circle the seventh mentally and check that it steps down in the next chord before you move on.
Both are resolution errors involving a tendency tone in V7, but they pull in opposite directions. The leading tone (scale degree 7, the chord's third) wants to rise by step to tonic, while the chordal seventh (scale degree 4) must fall by step to scale degree 3. A released-style MCQ asks exactly this contrast. Remember it as the leading tone pushes up, the seventh sinks down, and the two squeeze inward onto the tonic chord.
An unresolved seventh happens when the chordal seventh of a seventh chord does not resolve down by step into the next chord, and it counts as a voice-leading error in 18th-century style.
PIT-4.A.8 is the rule behind the term. All chordal sevenths should resolve by descending step specifically to avoid an unresolved seventh.
In V7 to I, the seventh is scale degree 4 and resolves down to scale degree 3, while the leading tone resolves up to tonic. The two tendency tones move in opposite directions.
Approach matters too. PIT-4.A.7 says approach the chordal seventh by common tone or by step, with leaps only when the context leaves no other option.
On part-writing FRQs, check every seventh chord you write. The voice holding the seventh must step down in the next chord or you lose points.
It's a voice-leading error where the seventh of a seventh chord fails to resolve down by step in the following chord. In a V7 in C major, the F must fall to E; if that voice leaps away or moves up instead, the seventh is unresolved.
No, not in standard 18th-century practice. The CED (PIT-4.A.8) says all chordal sevenths should resolve by descending step, so an upward-moving seventh is treated as an unresolved seventh on the exam.
They involve different tendency tones with opposite pulls. The leading tone (scale degree 7) resolves up to tonic, while the chordal seventh (scale degree 4 in V7) resolves down by step. The exam loves asking you to contrast the two in a V7 to I progression.
Down by step to the third of the tonic chord. In C major, the F in G-B-D-F resolves to E. It does not resolve to the tonic note itself.
By common tone or by step, per PIT-4.A.7. If neither is possible, an ascending leap is acceptable, and a descending leap of a third is allowed only rarely.