Questions: Major vs. Minor Mode: Quality and Character

Question 1

A piece begins and ends on C, prominently features E♭ in its melody, and uses C minor and F minor as its main chords. A listener argues: 'It has an F minor chord, which is iv — so it could be in C major.' What is wrong with this reasoning?

• A. F minor is actually ii in C major, not iv
• B. Mode is determined by the overall scale and tonal center, not by the presence of a single chord type; the consistent E♭ and the C minor tonic clearly establish C minor
• C. You cannot identify mode from chord content at all
• D. The argument is correct — the F minor chord does suggest C major

Answer: (B)

The listener has confused a chord's Roman numeral label with its mode implications. Yes, minor iv chords can appear in major keys as borrowed chords — but that's a special case. What determines mode is the overall tonal center and the scale surrounding it. Here, the combination of a C tonic, consistent E♭ (the flatted third), and minor harmonies throughout points unambiguously to C minor. Mode is heard as a global property of the piece, not inferred from a single chord in isolation.

Question 2

When trying to identify the mode of an unfamiliar piece by ear, the most reliable single scale degree to focus on is:

• A. Scale degree 7 (the leading tone)
• B. Scale degree 4 (the subdominant)
• C. Scale degree 3 (the mediant)
• D. Scale degree 5 (the dominant)

Answer: (C)

Scale degree 3 — the mediant — is the most reliable modal marker. In major, it sits a major third above the tonic; in minor, a minor third. This is the same interval difference you hear when distinguishing major from minor chords. Melodies frequently emphasize scale degree 3, and the ear learns to latch onto it quickly. Scale degrees 4 and 5 are the same in major and natural minor, making them useless for discrimination. Scale degree 7 helps in harmonic minor (raised 7) but is variable across minor types.

Question 3

Hearing a minor chord in a passage is sufficient evidence to conclude that the passage is in a minor key.

• T. True
• F. False

Answer: False

Minor chords appear frequently in major keys: the vi chord (e.g., Am in C major), the ii chord (Dm in C major), and the iii chord are all minor. A piece in C major can be full of minor chords. Mode is determined by what pitch functions as the tonal center and by the overall scale surrounding it, not by tallying chord qualities.

Question 4

Scale degree 3 is the most reliable single indicator of mode because it forms a major third above the tonic in major keys and a minor third above the tonic in minor keys — the same quality difference that distinguishes major from minor chords.

• T. True
• F. False

Answer: True

This is exactly right. The tonic triad in major is built on scale degrees 1–3–5; scale degree 3 sits a major third above scale degree 1. The tonic triad in minor has the same structure except scale degree 3 is a minor third above 1. So the ear's ability to discriminate major thirds from minor thirds (already trained in chord quality work) transfers directly to mode identification via scale degree 3.

Question 5

What is the practical strategy for identifying the mode of an unfamiliar piece by ear, and why does focusing on the tonic triad work?

Model answer: First, identify the tonic — the pitch that feels like home, the point of rest. Then ask whether the space surrounding that tonic feels bright and open (major) or compact and weighted (minor). A concrete check: imagine or sing the tonic triad. If it feels like a major chord, the piece is in major; if minor, the piece is in minor. The tonic triad is built on scale degrees 1, 3, and 5 of the key, so its quality directly encodes the mode.

The tonic triad works as a diagnostic because scale degree 3 — the most reliable modal marker — is one of its three pitches. When you sing or imagine the tonic chord, you are activating scale degree 3 and hearing its relationship to the tonic. Major third = major mode; minor third = minor mode. This is why the strategy is reliable: it reduces mode identification to chord quality discrimination, a skill already developed through earlier ear training.