---
title: "Major Chord — AP Music Theory Definition & Exam Guide"
description: "A major chord stacks a major third and perfect fifth above a root. Learn how major chords show up in minor keys, why V is major in harmonic minor, and how AP tests it."
canonical: "https://fiveable.me/ap-music-theory/key-terms/major-chord"
type: "key-term"
subject: "AP Music Theory"
unit: "Unit 2"
---

# Major Chord — AP Music Theory Definition & Exam Guide

## Definition

A major chord is a triad built from a root, a major third (4 half steps above the root), and a perfect fifth (7 half steps above the root). On the AP Music Theory exam, you identify major chords by ear and in notation, including inside minor keys where the harmonic minor scale creates a major V chord.

## What It Is

A major chord (or [major triad](/ap-music-theory/key-terms/major-triad "fv-autolink")) is three [notes](/ap-music-theory/unit-1/rhythmic-values/study-guide/U8CmLtTY0617W10Qwt6B "fv-autolink") stacked in thirds: a root, a note a major third above it (4 half steps), and a note a perfect fifth above it (7 half steps). Another way to think about it is a major third on the bottom and a minor third on top. C-E-G is the classic example. The sound is bright and stable, which is why your ear hears it as 'resolved' or 'happy.'

Here's the part that trips people up. [Major](/ap-music-theory/unit-2/interval-size-quality/study-guide/HxrxB0vETN0eDp83zij1 "fv-autolink") chords don't only live in major keys. Build triads on each scale degree of any scale and you get a mix of qualities. In a major key, the I, IV, and V chords are major. In natural minor, the major chords land on III, VI, and VII. And when composers raise the 7th scale degree (the harmonic minor form from Topic 2.1), the v chord becomes a major V, which is exactly why harmonic minor exists. The raised note creates a leading tone, and the leading tone turns the dominant chord major so it pulls hard back to tonic.

## Why It Matters

Major chords connect directly to [Unit 2](/ap-music-theory/unit-2 "fv-autolink") (Music Fundamentals II) and Topic 2.1, where learning objective 2.1.A asks you to identify natural, harmonic, and [melodic minor](/ap-music-theory/key-terms/melodic-minor "fv-autolink") forms in both performed and notated music. Why does a chord matter for a scale topic? Because chord quality is built from scale patterns. Essential knowledge PIT-1.G.1 tells you that scales are specific patterns of half and whole steps, and those patterns determine which triads come out major, minor, or diminished. The single best example is the harmonic minor scale, whose whole reason for existing is harmonic. Raising scale degree 7 converts the minor v chord into a major V with a leading tone. If you can spot that major V in a minor key, you can instantly tell harmonic minor is in play, which is exactly the identification skill 2.1.A tests.

## Connections

### Minor Chord (Unit 2)

A minor chord flips the stack. It puts the [minor third](/ap-music-theory/key-terms/minor-third "fv-autolink") on the bottom (root, minor third, perfect fifth) instead of on top. The only difference between C major and C minor is one note, E versus E♭, so quality identification questions come down to hearing or reading that single half step.

### [Leading Tone (Unit 2)](/ap-music-theory/key-terms/leading-tone)

The [leading tone](/ap-music-theory/key-terms/leading-tone "fv-autolink") is the reason minor keys borrow a major chord. Raising scale degree 7 in harmonic minor gives the dominant chord a major third, and that major third is the leading tone pulling up to tonic. Major V in a minor key equals harmonic minor, full stop.

### Diatonic Harmony (Units 3-4)

Once you move past fundamentals, every diatonic triad gets a quality label. In [major keys](/ap-music-theory/key-terms/major-key "fv-autolink"), I, IV, and V are the major ones. In minor keys (natural form), it's III, VI, and VII. Knowing this map by heart makes later chord-identification and part-writing questions much faster.

### [Tonic (Unit 2)](/ap-music-theory/key-terms/tonic)

The tonic chord's quality tells you the mode of the piece. A major tonic triad means a major key; a minor tonic means a minor key, even if that minor key still uses major chords elsewhere (like V or VI). Don't judge the key by one major chord. Judge it by the tonic.

## On the AP Exam

Major chords get tested two ways: aurally and in notation, matching the dual format of 2.1.A. Aural questions play a triad or short passage and ask you to identify the chord quality, so you need the bright major sound locked into your ear against minor and diminished. Notation questions show you a triad and ask its quality, or ask which chords in a given key are major. Practice questions love the scale-degree angle, like asking what quality the ii chord is in natural minor (it's diminished, not major, which is the trap). The highest-yield fact is the harmonic minor connection. If an excerpt in a minor key has a major V chord or a raised 7th, that's your evidence for harmonic minor, and that exact reasoning shows up in scale-identification questions.

## Major Chord vs Minor Chord

Both chords share the same root and perfect fifth. The difference is entirely in the third. A major chord has a major third above the root (4 half steps); a minor chord has a minor third (3 half steps). C-E-G is major, C-E♭-G is minor. Aurally, major sounds bright and minor sounds dark, but on notation questions count the half steps from root to third rather than trusting your eyes, since accidentals and key signatures can flip the quality.

## Key Takeaways

- A major chord is a root plus a major third (4 half steps) plus a perfect fifth (7 half steps), like C-E-G.
- Major and minor chords differ by one note only: the third is a half step higher in major than in minor.
- Major chords appear in minor keys too. In natural minor they fall on scale degrees III, VI, and VII.
- Harmonic minor raises scale degree 7 specifically to turn the dominant chord major, creating a leading tone that pulls to tonic.
- Spotting a major V chord or raised 7th in a minor-key passage is your evidence for identifying the harmonic minor scale, the skill in learning objective 2.1.A.
- Judge a piece's mode by the tonic chord's quality, not by whether any major chord happens to appear.

## FAQs

### What is a major chord in music theory?

A major chord is a triad made of a root, a major third (4 half steps above the root), and a perfect fifth (7 half steps above the root). C-E-G is the standard example, and it has a bright, stable sound.

### What's the difference between a major chord and a minor chord?

Only the third changes. A major chord's third is 4 half steps above the root (C-E-G), while a minor chord's third is 3 half steps above (C-E♭-G). The root and fifth are identical.

### Do major chords only appear in major keys?

No. Minor keys contain major chords too. In natural minor, the III, VI, and VII triads are major, and in harmonic minor the V chord becomes major because the 7th scale degree is raised.

### Why is the V chord major in a minor key?

Because of the harmonic minor scale. Raising scale degree 7 creates a leading tone a half step below tonic, which makes the dominant triad major and gives it a much stronger pull back to the tonic chord.

### How do I identify a major chord by ear on the AP Music Theory exam?

Listen for the bright, resolved quality, and compare it mentally against the darker minor triad. Drill major vs. minor pairs on the same root so you're hearing the half-step difference in the third, since that's the only note that changes.

## Related Study Guides

- [2.1 Minor Scales: Natural, Harmonic, and Melodic](/ap-music-theory/unit-2/minor-scales-natural-harmonic-melodic/study-guide/qr9dlJVFzAEHDe8B90yY)

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