Questions: Diatonic Chord Quality Recognition

Question 1

You hear a minor-quality chord in a major key. Which scale degrees could it be built on?

• A. Only scale degree 2 (ii), since minor chords are uncommon in major keys
• B. Scale degrees 2, 3, and 6 (ii, iii, vi) — all three produce minor triads in a major key
• C. Scale degrees 1, 4, and 5 (I, IV, V) — the primary minor-quality chords
• D. Any scale degree, depending on which major key is being used

Answer: (B)

In any major key, the chord quality at each scale degree is fixed by the key signature. Major thirds built on degrees 1, 4, and 5 produce major triads; minor thirds built on degrees 2, 3, and 6 produce minor triads; and degree 7 produces a diminished triad. Hearing a minor chord narrows it to ii, iii, or vi — but you need harmonic context to identify which one.

Question 2

You hear a chord that sounds highly tense and unstable, with an unmistakable pull toward resolution to the tonic. Which diatonic chord quality is this most likely in a major key?

• A. Major — the dominant V chord has strong pull toward tonic
• B. Minor — the ii chord creates pre-dominant tension
• C. Diminished — the vii° chord's tritone interval creates maximum tension and strongly implies resolution to I
• D. Augmented — this quality signals instability more than any other

Answer: (C)

The vii° (diminished) chord is built from two stacked minor thirds, creating a tritone interval that is maximally dissonant within diatonic harmony. Its resolution to I is almost gravitational. While V is also tense, its dominant pull is more stable-sounding than vii°'s acute instability. The diminished quality combined with that resolution tendency is the most distinctive sound in the diatonic system. Note: augmented chords are not naturally occurring in a major key.

Question 3

In a major key, the chord built on scale degree 7 is always a diminished triad.

• T. True
• F. False

Answer: True

This follows directly from the major scale's interval structure. Scale degree 7 (the leading tone) sits a half step below the tonic. Stacking thirds from it using only the key's notes produces a minor third (7 to 2) and another minor third (2 to 4), giving a diminished triad. This is true in any major key — the pattern of qualities is invariant. It's one of the most distinctive and useful facts in diatonic ear training.

Question 4

Hearing the quality (major, minor, or diminished) of a chord is sufficient to identify which diatonic chord it is in a major key.

• T. True
• F. False

Answer: False

Quality alone narrows the possibilities but doesn't determine the chord. A major chord could be I, IV, or V; a minor chord could be ii, iii, or vi. Identifying the specific diatonic chord requires combining quality recognition with harmonic context: the surrounding chords, the bass note, the sense of tension or resolution, and where the chord goes next. Quality is the starting point; function and context complete the identification.

Question 5

Why does chord quality alone not tell you which diatonic chord you are hearing, and what additional information resolves the ambiguity?

Model answer: In a major key, three chords share major quality (I, IV, V) and three share minor quality (ii, iii, vi). Quality identifies the interval structure but not the scale degree. To distinguish I from IV from V, you need harmonic context: where the chord comes from and where it goes, the bass motion, and the sense of tension and resolution. V sounds like it needs to move to I (dominant pull); IV sounds like it's approaching V (pre-dominant tension); I sounds stable and settled (tonic arrival). This combination of quality plus function is what makes diatonic ear training genuinely musical.

The practical implication is that ear training for diatonic chords should always happen in musical context — listening to progressions, not isolated chords. The harmonic function (tonic, pre-dominant, dominant) is carried not just by the chord's internal quality but by its relationship to the surrounding harmony. Training your ear to hear function, not just quality, is the goal.