Questions: Scale Degree Function: The Leading Tone

Question 1

You're listening to a minor-key piece and the dominant chord resolves to the tonic with a strong, conclusive feel — nearly as strong as a major-key V–I cadence. What has the composer most likely done?

• A. Used the natural minor scale throughout, which always produces a strong dominant resolution
• B. Raised scale degree 7 by a half step to create a leading tone in the dominant chord
• C. Lowered scale degree 5 to create additional tension before the tonic
• D. Used the Dorian mode, which has a stronger dominant pull than natural minor

Answer: (B)

In natural minor, scale degree 7 is a whole step below the tonic (the subtonic), and lacks the strong upward pull of a leading tone. To get the conclusive V–I resolution that defines common-practice tonal music, composers raise scale degree 7 by a half step — this is the harmonic minor scale. That raised 7th becomes the third of the dominant chord (V), and its semitone distance from the tonic creates the characteristic forward pull. If the resolution feels strong and decisive in a minor key, a raised 7th is almost certainly the reason.

Question 2

A student sings a C major scale from do to ti (scale degrees 1–7) and says 'ti sounds complete and settled — it's the top of the scale.' What is wrong with this perception?

• A. Nothing — ti is the penultimate pitch and is harmonically neutral
• B. The student is correct only if they stop on ti for long enough
• C. Ti (scale degree 7) is unstable — its semitone distance from do creates strong upward tension toward the tonic, not a sense of rest
• D. The student is correct in major keys but wrong in minor keys

Answer: (C)

The leading tone is one of the most active, unstable scale degrees. Stopping a scale on ti creates a sense of incompleteness — the phrase seems to be suspended midair, pulling urgently toward do. This is precisely its function: that half-step distance generates the forward momentum that makes dominant-to-tonic resolutions feel conclusive. A student who hears ti as settled has not yet internalized the leading tone's gravitational field.

Question 3

The leading tone in a major key has a strong pull toward the tonic, but in natural minor, scale degree 7 has no comparable pull because it is a whole step away.

• T. True
• F. False

Answer: True

This is the crucial distinction the topic builds toward. In C major, B (scale degree 7) is a half step below C — that semitone distance creates the leading tone's characteristic urgency. In C natural minor, the seventh scale degree is Bb, a whole step below C. Without the semitone gap, the gravitational pull disappears. This pitch is called the subtonic and sounds modal or settled rather than tense. Composers deliberately raise it when they want leading-tone function in minor.

Question 4

The leading tone's pull toward the tonic exists because it is the highest pitch in the scale, and higher pitches naturally want to resolve downward.

• T. True
• F. False

Answer: False

The pull has nothing to do with register — it comes from the semitone interval. If it were about being the highest pitch, the subtonic in natural minor (also the seventh and highest pitch before the octave tonic) would have the same pull. It doesn't. Conversely, the leading tone creates upward pull — it resolves up by a half step to the tonic above it, not downward. The mechanism is intervallic proximity, not melodic height.

Question 5

Why do composers writing in minor keys often raise scale degree 7 specifically in dominant chords, and what happens aurally if they leave it unraised?

Model answer: The raised 7th creates a semitone — the leading tone — just below the tonic, generating the strong upward tension that makes V–I feel conclusive. In the dominant chord (V), scale degree 7 is the third of the chord; raising it by a half step turns it into a leading tone. If left unraised (as in natural minor), the dominant chord contains the subtonic instead, which has no strong pull toward the tonic. The resolution still works harmonically but feels weaker, more ambiguous, or modal — less like a decisive tonal arrival and more like a gentle settling. This is why harmonic minor exists as a distinct scale: it codifies the raised 7th that tonal composers routinely used to preserve leading-tone function in minor.

The aural difference is audible and reliable in ear training: a V–I with a raised leading tone snaps into the tonic with finality; a V–I with the unraised subtonic sounds more tentative or archaic. Trained listeners use this signal to detect whether a minor-key piece is using harmonic minor (decisive, common-practice tonal) or natural/Aeolian minor (modal, folk-like, or deliberately unresolved).