You hear a four-note chord that sounds tense and directional — it seems to want to move somewhere else. Which chord type best matches this description, and what interval inside it creates that feeling?
AMajor seventh chord (maj7) — the major seventh interval creates the pull
BDominant seventh (V7) — it contains a tritone between the third and seventh that demands resolution
CMinor seventh chord (min7) — the minor seventh is the most unstable interval
DDiminished seventh (dim7) — its symmetrical structure creates tension without direction
The dominant seventh (V7) is defined by its tritone — the interval between its third and seventh. The tritone (augmented fourth / diminished fifth) is the most dissonant interval in tonal music and pulls inward toward resolution: the third rises by half step to the tonic, and the seventh falls by half step to the third of the tonic chord. This gives V7 its directional quality. Maj7 and min7 are more stable and open-ended. Dim7 is highly tense but symmetrical — it doesn't pull toward a single resolution the way V7 does.
Question 2 Multiple Choice
A student confuses a major seventh chord (Cmaj7) with a dominant seventh chord (C7). What is the key structural difference they should listen for?
ACmaj7 has a minor third on top; C7 has a major third on top
BCmaj7 contains a major seventh interval above the root (only a half-step below the octave); C7 contains a minor seventh (a whole step below the octave), creating the tritone
CThey sound identical — the distinction is only visible in notation, not audible
DCmaj7 resolves to F; C7 resolves to G
The critical difference is the quality of the seventh. In Cmaj7 (C-E-G-B), the interval C→B is a major seventh — just a half-step below the octave, creating a dreamy, open sound. In C7 (C-E-G-B♭), the interval C→B♭ is a minor seventh — a whole step below the octave. This B♭ combined with the E creates the tritone (E→B♭), which gives C7 its tension and pull toward resolution on F major. Maj7 is stable and lush; V7 is tense and directional.
Question 3 True / False
A diminished seventh chord has a distinctive symmetrical structure because every interval in the chord is a minor third.
TTrue
FFalse
Answer: True
Yes — a dim7 chord (e.g., C-E♭-G♭-B♭♭) stacks four minor thirds, each exactly three semitones apart. This equal spacing creates perfect symmetry: the chord divides the octave into four equal parts. A consequence is that each of its four inversions is enharmonically equivalent to another dim7 chord in root position — there are only three genuinely distinct dim7 sounds. This symmetry makes dim7 harmonically ambiguous and useful for modulation in Romantic music.
Question 4 True / False
A major seventh chord (maj7) is functionally unstable and demands resolution to the tonic, similar to a dominant seventh chord.
TTrue
FFalse
Answer: False
Maj7 is among the more stable seventh chord types. It most often appears on the tonic (Imaj7) or subdominant (IVmaj7) and doesn't demand resolution — in jazz, Imaj7 IS the stable resting point. The dominant seventh (V7) demands resolution because of its tritone. Maj7's seventh is only a half-step from the octave, creating a rich, lush color without the pushing tension of the tritone. Conflating these two is one of the most common errors in seventh chord ear training.
Question 5 Short Answer
What is the tritone, and why does its presence in the dominant seventh chord give V7 its characteristic urgency and pull toward resolution?
Think about your answer, then reveal below.
Model answer: The tritone is the interval of three whole tones (6 semitones) — an augmented fourth or diminished fifth. In a dominant seventh chord (e.g., G7: G-B-D-F), the tritone occurs between the third (B) and seventh (F). This interval is maximally dissonant in tonal music and wants to resolve inward: B rises a half-step to C (the tonic), and F falls a half-step to E (the third of the tonic chord). This double voice-leading motion is what makes V7 resolve so strongly to I.
The tritone's instability is both acoustic (its frequency ratios are complex) and contextual (centuries of tonal practice have conditioned listeners to hear it as needing resolution). Its resolution in V7→I is the most powerful cadential gesture in Western tonal music. Recognizing the tritone by ear — that particular tense, hanging quality — is the key to identifying dominant sevenths quickly.